| Shuichi Matsukiyo | Last modified date：2023.09.27 |
Professor /
Space Environmental Fluid Dynamics /
Department of Advanced Environmental Science and Engineering /
Faculty of Engineering Sciences
Papers
| 1. | , [URL]. |
| 2. | Isayama, S. ; Takahashi, K. ; Matsukiyo, S. ; Sano, T., Acceleration of Relativistic Particles in Counterpropagating Circularly Polarized Alfvén Waves, The Astrophysical Journal, 10.3847/1538-4357/acbb6d, 946, 2, 68-1-68-8, 2023.03, [URL], Counterpropagating Alfvén waves are ubiquitously observed in many astrophysical environments, such as a star surface and a planetary foreshock. We discuss an efficient particle acceleration mechanism in two counterpropagating circularly polarized Alfvén waves. Phase transitions of particle behavior occur when wave amplitudes exceed two critical values. Above the critical amplitudes, the numerical simulation shows that any particles irreversibly gain relativistic energy within a short time regardless of their initial position and energy once the coherent waveform is formed. The accelerated particles have spatial coherence. Higher wave phase velocity requires smaller critical amplitudes, while the maximum attainable energy increases as the wavenumber and the frequency decrease. The results may be applicable in some astrophysical phenomena, as well as a future laboratory experiment using high-power lasers.. |
| 3. | Sakai, K.; Nishimoto, T.; Isayama, S.; Matsukiyo, S.; Kuramitsu, Y., Ion-acoustic feature of collective Thomson scattering in non-equilibrium two-stream plasmas, Physics of Plasmas, 10.1063/5.0117812, 30, 1, 012105-1-012105-9, 2023.01, [URL], We theoretically and numerically investigate the ion-acoustic features of collective Thomson scattering (CTS) in two-stream plasmas. When the electron distribution functions of two (stationary and moving) components overlap with each other at the phase velocities corresponding to the two resonant peaks of the ion-acoustic feature, the theoretical spectrum shows asymmetry because the rate of electron Landau damping is different for the two peaks. The results of numerical simulations agree well with the theoretical spectra. We also demonstrate the effect of a two-stream-type instability in the ion-acoustic feature. The simulated spectrum in the presence of the instability shows an asymmetry with the opposite trend to the overlapped case, which results from the temporal change of the electron distribution function caused by the instability. Our results show that two-stream plasmas have significant effects on CTS spectra and that the waves resulting from instabilities can be observed in the ion-acoustic feature.. |
| 4. | K. Sakai; T. Nisimoto; S. Isayama; S. Matsukiyo; Y. Kuramitsu, Ion-acoustic feature of collective Thomson scattering in non-equilibrium two-stream plasmas, Physics of Plasmas, 10.1063/5.0117812, 30, 012105-1-012105-9, vol.30, 012105, 2023.01, [URL]. |
| 5. | , [URL]. |
| 6. | Yoshida K, Matsukiyo S, Washimi H, Hada T, Numerical study of statistical behaviors of galactic cosmic rays invading the heliosphere, Acta Physica Polonica B Proceedings Supplement, 15, 3, A20, 2022.09, [URL]. |
| 7. | Amano, T.; Matsumoto, Y.; Bohdan, A.; Kobzar, O.; Matsukiyo, S.; Oka, M.; Niemiec, J.; Pohl, M.; Hoshino, M., Nonthermal electron acceleration at collisionless quasi-perpendicular shocks, Reviews of Modern Plasma Physics, 10.1007/s41614-022-00093-1, 6, 29, 2022.09, [URL]. |
| 8. | Matsukiyo, S.; Yamazaki, R.; Morita, T.; Tomita, K. ; Kuramitsu, Y. ; Sano, T. ; Tanaka, S. J. ; Takezaki, T.; Isayama, S.; Higuchi, T.; Murakami, H.; Horie, Y.; Katsuki, N.; Hatsuyama, R.; Edamoto, M.; Nishioka, H.; Takagi, M.; Kojima, T.; Tomita, S.; Ishizaka, N.; Kakuchi, S.; Sei, S.; Sugiyama, K.; Aihara, K.; Kambayashi, S.; Ota, M.; Egashira, S.; Izumi, T.; Minami, T.; Nakagawa, Y.; Sakai, K.; Iwamoto, M.; Ozaki, N.; Sakawa, Y., High-power laser experiment on developing supercritical shock propagating in homogeneously magnetized plasma of ambient gas origin, Physical Review E, 10.1103/PhysRevE.106.025205, 106, 025205, 2022.08, [URL]. |
| 9. | Sakai K, Moritaka T, Morita T, Tomita K, Minami T, Nishimoto T, Egashira S, Ota M, Sakawa Y, Ozaki N, Kodama R, Kojima T, Takezaki T, Yamazaki R, Tanaka S. J, Aihara K, Koenig M, Albertazzi B, Mabey P, Woolsey N, Matsukiyo S, Takabe H, Hoshino M, Kuramitsu Y, Direct observations of pure electron outflow in magnetic reconnection, Scientific Reports, 10.1038/s41598-022-14582-3, 12, 1, 10921, 2022.06, [URL], Abstract Magnetic reconnection is a universal process in space, astrophysical, and laboratory plasmas. It alters magnetic field topology and results in energy release to the plasma. Here we report the experimental results of a pure electron outflow in magnetic reconnection, which is not accompanied with ion flows. By controlling an applied magnetic field in a laser produced plasma, we have constructed an experiment that magnetizes the electrons but not the ions. This allows us to isolate the electron dynamics from the ions. Collective Thomson scattering measurements reveal the electron Alfvénic outflow without ion outflow. The resultant plasmoid and whistler waves are observed with the magnetic induction probe measurements. We observe the unique features of electron-scale magnetic reconnection simultaneously in laser produced plasmas, including global structures, local plasma parameters, magnetic field, and waves.. |
| 10. | Girgis, M. K.; Hada, T.; Matsukiyo, S.; Yoshikawa, A., Radiation Analysis of LEO Mission in the South Atlantic Anomaly During Geomagnetic Storm, IEEE Journal of Radio Frequency Identification, 10.1109/JRFID.2022.3163441, 6, 292-298, 2022.04, [URL]. |
| 11. | Otsuka F, Matsukiyo S, Oka M, Bursty betatron acceleration of electrons at nonstationary quasi-perpendicular shocks, 37th International Cosmic Ray Conference, 395, 1344, 2022.03, [URL]. |
| 12. | Niemiec J, Kobzar O, Fułat K, Pohl M, Amano T, Hoshino M, Matsukiyo S, Matsumoto Y, Electron Pre-acceleration Through Stochastic Shock Drift Acceleration at Intracluster Shocks, 37th International Cosmic Ray Conference, 395, 477, 2022.03, [URL]. |
| 13. | Iwamoto M, Amano T, Matsumoto Y, Matsukiyo S, Hoshino M, Particle-in-Cell Simulations of Synchrotron Maser Emission and Associated Particle Acceleration in Relativistic Shocks, 37th International Cosmic Ray Conference, 395, 162, 2022.03, [URL]. |
| 14. | Girgis K. M, Hada T, Matsukiyo S, Seasonal variation and geomagnetic storm index effects on the proton flux response in the South Atlantic Anomaly by test particle simulations, Journal of Space Weather and Space ClimateAtmospheric and Solar-Terrestrial Physics, 10.1016/j.jastp.2021.105808, 228, 105808(1)-105808(9), 2022.02, [URL]. |
| 15. | Yamazaki, R. ; Matsukiyo, S. ; Morita, T. ; Tanaka, S. J. ; Umeda, T. ; Aihara, K. ; Edamoto, M. ; Egashira, S. ; Hatsuyama, R. ; Higuchi, T. ; Hihara, T. ; Horie, Y. ; Hoshino, M. ; Ishii, A. ; Ishizaka, N. ; Itadani, Y. ; Izumi, T. ; Kambayashi, S. ; Kakuchi, S. ; Katsuki, N. ; Kawamura, R. ; Kawamura, Y. ; Kisaka, S. ; Kojima, T. ; Konuma, A. ; Kumar, R. ; Minami, T. ; Miyata, I. ; Moritaka, T. ; Murakami, Y. ; Nagashima, K. ; Nakagawa, Y. ; Nishimoto, T. ; Nishioka, Y. ; Ohira, Y. ; Ohnishi, N. ; Ota, M. ; Ozaki, N. ; Sano, T. ; Sakai, K. ; Sei, S. ; Shiota, J. ; Shoji, Y. ; Sugiyama, K. ; Suzuki, D. ; Takagi, M. ; Toda, H. ; Tomita, S. ; Tomiya, S. ; Yoneda, H. ; Takezaki, T. ; Tomita, K. ; Kuramitsu, Y. ; Sakawa, Y., High-power laser experiment forming a supercritical collisionless shock in a magnetized uniform plasma at rest, Physical Review E, 10.1103/PhysRevE.105.025203 , 105, 025203(1)-025203(16), 2022.02, [URL]. |
| 16. | Iwamoto, M.; Amano, T.; Matsumoto, Y.; Matsukiyo, S.; Hoshino, M., Particle acceleration by pickup process upstream of relativistic shocks, The Astrophysical Journal, 10.3847/1538-4357/ac38aa, 924, 2, 108(1)-108(14), 2022.01, [URL]. |
| 17. | Girgis, K. M.; Hada, T.; Matsukiyo, S.; Yoshikawa, A., Inner radiation belt simulations of the proton flux response in the South Atlantic Anomaly during the Geomagnetic Storm of 15 May 2005, Journal of Space Weather and Space Climate, 10.1051/swsc/2021031, 11, 48(1)-48(10), 2021.09, [URL]. |
| 18. | Kobzar, O.; Niemiec, J.; Amano, T.; Hoshino, M.; Matsukiyo, S.; Matsumoto, Y.; Pohl, M., Electron Acceleration at Rippled Low-mach-number Shocks in High-beta Collisionless Cosmic Plasmas, The Astrophysical Journal, 10.3847/1538-4357/ac1107, 919, 2, 97(1)-97(12), 2021.09, [URL]. |
| 19. | Kotaro Yoshida, Shuichi Matsukiyo, Haruichi Washimi, Tohru Hada, Trajectory analysis of galactic cosmic rays invading into the heliosphere, The Astrophysical Journal, 10.3847/1538-4357/ac02c2, 916, 1, 29(1)-29(9), 2021.07, [URL]. |
| 20. | Ligorini, A.; Niemiec, J.; Kobzar, O.; Iwamoto, M.; Bohdan, A.; Pohl, M.; Matsumoto, Y.; Amano, T.; Matsukiyo, S.; Esaki, Y.; Hoshino, M., Mildly relativistic magnetized shocks in electron-ion plasmas - I. Electromagnetic shock structure, Monthly Notices of the Royal Astronomical Society, 10.1093/mnras/staa3901, 501, 4837-4849, 2021.01, [URL], Mildly relativistic shocks in magnetized electron-ion plasmas are investigated with 2D kinetic particle-in-cell simulations of unprecedentedly high resolution and large scale for conditions that may be found at internal shocks in blazar cores. Ion-scale effects cause corrugations along the shock surface whose properties somewhat depend on the configuration of the mean perpendicular magnetic field, that is either in or out of the simulation plane. We show that the synchrotron maser instability persists to operate in mildly relativistic shocks in agreement with theoretical predictions and produces coherent emission of upstream-propagating electromagnetic waves. Shock front ripples are excited in both mean-field configurations and they engender effective wave amplification. The interaction of these waves with upstream plasma generates electrostatic wakefields.. |
| 21. | Ligorini, A.; Niemiec, J.; Kobzar, O.; Iwamoto, M.; Bohdan, A.; Pohl, M.; Matsumoto, Y.; Amano, T.; Matsukiyo, S.; Hoshino, M., Mildly relativistic magnetized shocks in electron-ion plasmas - II. Particle acceleration and heating, Monthly Notices of the Royal Astronomical Society, 10.1093/mnras/stab220, 502, 5065-5074, 2021.01, [URL], Particle acceleration and heating at mildly relativistic magnetized shocks in electron-ion plasma are investigated with unprecedentedly high-resolution 2D particle-in-cell simulations that include ion-scale shock rippling. Electrons are super-adiabatically heated at the shock, and most of the energy transfer from protons to electrons takes place at or downstream of the shock. We are the first to demonstrate that shock rippling is crucial for the energization of electrons at the shock. They remain well below equipartition with the protons. The downstream electron spectra are approximately thermal with a limited supra-thermal power-law component. Our results are discussed in the context of wakefield acceleration and the modelling of electromagnetic radiation from blazar cores.. |
| 22. | Sakai, K.; Isayama, S.; Bolouki, N.; Habibi, M. S.; Liu, Y. L.; Hsieh, Y. H.; Chu, H. H.; Wang, J.; Chen, S. H.; Morita, T.; Tomita, K.; Yamazaki, R.; Sakawa, Y.; Matsukiyo, S.; Kuramitsu, Y., Collective Thomson scattering in non-equilibrium laser produced two-stream plasmas, Physics of Plasmas, 10.1063/5.0011935, 27, 103104(1)-103104(13), 2020.10, [URL], We investigate collective Thomson scattering (CTS) in two-stream non-equilibrium plasmas analytically, numerically, and experimentally. In laboratory astrophysics, CTS is a unique tool to obtain local plasma diagnostics. While the standard CTS theory assumes plasmas to be linear, stationary, isotropic, and equilibrium, they are often nonlinear, non-stationary, anisotropic, and non-equilibrium in high energy phenomena relevant to laboratory astrophysics. We theoretically calculate and numerically simulate the CTS spectra in two-stream plasmas as a typical example of a non-equilibrium system in space and astrophysical plasmas. The simulation results show the feasibility to diagnose two-stream instability directly via CTS measurements. To confirm the non-equilibrium CTS analysis, we have developed an experimental system with a high repetition rate tabletop laser for laboratory astrophysics.. |
| 23. | Yang, Z.; Liu, Y. D.; Matsukiyo, S.; Lu, Q.; Guo, F.; Liu, M.; Xie, H.; Gao, X.; Guo, J., PIC simulations of microinstabilities and waves at near-sun solar wind perpendicular shocks: Predictions for Parker Solar Probe and Solar Orbiter, The Astrophysical Journal Letters, 10.3847/2041-8213/abaf59, 900, 2, L24(1)-L24(8), 2020.09, [URL], PIC Simulation of a Shock Tube: Implications for Wave Transmission in the Heliospheric Boundary Region. |
| 24. | Matsukiyo, S., Parametric instabilities in a two ion species plasma as a driver of super Alfvenic waves, Journal of Physics: Conference Series, 10.1088/1742-6596/1620/1/012013, 1620, 012013(1)-012013(12), 2020.09, [URL]. |
| 25. | Morita, T.; Tomita, K.; Sakai, K.; Takagi, M.; Aihara, K.; Edamoto, M.; Egashira, S.; Higuchi, T.; Ishizaka, N.; Izumi, T.; Kakuchi, S.; Kojima, T.; Kuramitsu, Y.; Matsukiyo, S.; Nakagawa, Y.; Minami, T.; Murakami, H.; Nishioka, Y.; Ota, M.; Sano, T. Sei, S.; Sugiyama, K.; Tanaka, S. J.; Yamazaki, R.; Sakawa, Y., Local plasma parameter measurements in colliding laser-produced plasmas for studying magnetic reconnection, High Energy Density Physics, 10.1016/j.hedp.2020.100754, 36, 100754(1)-100754(4), 2020.08, [URL], We have implemented laser Thomson scattering for local plasma measurement of electron and ion temperatures, electron density, flow velocity, and charge state. The electron density increases by two times in the interaction of two plasma flows, indicating collisionless interaction. The density and velocity show fluctuations only at t=40 ns, and the density suddenly decreases, indicating the plasma ejection from the interaction region, which can be explained by a magnetic reconnection. The electron temperature in the double-flow is larger than that in the single flow. This may be explained by the energy transfer from the plasma kinetic energy to thermal energy. The ion temperature is much larger than electron temperature in the double-flow, and this may be explained by collisional effects between two plasmas, and/or possibly interpreted as a thermalization due to magnetic reconnection.. |
| 26. | Girgis, K. M.; Hada, T.; Matsukiyo, S., Solar wind parameter and seasonal variation effects on the south atlantic anomaly using Tsyganenko models, Earth, Planets and Space, 10.1186/s40623-021-01367-7, 72, 1, 100(1)-100(17), 2020.07, [URL], We studied the space weather effects on the South Atlantic Anomaly (SAA) magnetic response using Tsyganenko models. For the physical parameters characterizing the SAA, the study considered the minimum magnetic field, the location (longitude and latitude) of the SAA center, and the area of the SAA. Regarding the space weather parameters, we considered the solar wind dynamic pressure, the interplanetary magnetic field components, ByIMF and BzIMF , the Dst index, and the geodipole tilting angle. To study the magnetic field response of the SAA, several different versions of the Tsyganenko models, namely, T96, T01, and TS05, were used to describe the external magnetic field contributions. The main internal magnetic field was calculated by the International Geomagnetic Reference Field (IGRF-12). The magnetic field study of the SAA was realized in long- and short-term (seasonal and diurnal) variations. We found that the Dst index and the geodipole tilting angle were the strongest influencing parameters on the SAA magnetic field response at all altitudes. Moreover, it was revealed that both magnetic poles might be a possible cause of the SAA magnetic field response, resulting from the space weather conditions. Furthermore, the magnetic field behavior of the SAA was affected by hourly variations, where the largest changes occurred at dayside.. |
| 27. | Matsukiyo, S.; Noumi, T.; Zank, G. P.; Washimi, H.; Hada, T., PIC Simulation of a Shock Tube: Implications for Wave Transmission in the Heliospheric Boundary Region, The Astrophysical Journal, 10.3847/1538-4357/ab54c9, 888, 1, 11(1)-11(9), 2020.01, [URL], A shock tube problem is solved numerically by using one-dimensional full particle-in-cell simulations under the condition that a relatively tenuous and weakly magnetized plasma is continuously pushed by a relatively dense and strongly magnetized plasma having supersonic relative velocity. A forward and a reverse shock and a contact discontinuity are self-consistently reproduced. The spatial width of the contact discontinuity increases as the angle between the discontinuity normal and ambient magnetic field decreases. The inner structure of the discontinuity shows different profiles between magnetic field and plasma density, or pressure, which is caused by a non-MHD effect of the local plasma. The region between the two shocks is turbulent. The fluctuations in the relatively dense plasma are compressible and propagating away from the contact discontinuity, although the fluctuations in the relatively tenuous plasma contain both compressible and incompressible components. The source of the compressible fluctuations in the relatively dense plasma is in the relatively tenuous plasma. Only compressible fast mode fluctuations generated in the relatively tenuous plasma are transmitted through the contact discontinuity and propagate in the relatively dense plasma. These fast mode fluctuations are steepened when passing the contact discontinuity. This wave steepening and probably other effects may cause the broadening of the wave spectrum in the very local interstellar medium plasma. The results are discussed in the context of the heliospheric boundary region or heliopause.. |
| 28. | Yamazaki, R.; Shinoda, A.; Umeda, T.; Matsukiyo, S., Mach number and plasma beta dependence of the ion temperature perpendicular to the external magnetic field in the transition region of perpendicular collisionless shocks, AIP Advances, 10.1063/1.5129067, 9, 12, 125010(1)-125010(6), 2019.12, [URL], Ion temperature anisotropy is a common feature for (quasi-)perpendicular collisionless shocks. By using two-dimensional full particle simulations, it is shown that the ion temperature component perpendicular to the shock magnetic field at the shock foot region is proportional to the square of the Alfvén Mach number divided by the plasma beta. This result is also explained by a simple analytical argument in which the reflected ions get energy from an upstream plasma flow. By comparing our analytic and numerical results, it is also confirmed that the fraction of the reflected ions hardly depends on the plasma beta and the Alfvén Mach number when the square of the Alfvén Mach number divided by the plasma beta is larger than about 20.. |
| 29. | Matsukiyo, S.; Akamizu, T.; Hada, T., Heavy Ion Acceleration by Super-Alfvénic Waves, The Astrophysical Journal Letters, 10.3847/2041-8213/ab58cf, 887, 1, L2(1)-L2(4), 2019.12, [URL], A generation mechanism of super-Alfvénic (SPA) waves in multi-ion species plasma is proposed, and the associated heavy ion acceleration process is discussed. The SPA waves are thought to play important roles in particle acceleration since they have large wave electric fields because of their high phase velocity. It is demonstrated by using full particle-in-cell simulations that large amplitude proton cyclotron waves, excited due to proton temperature anisotropy, nonlinearly destabilize SPA waves through parametric decay instability in a three-component plasma composed of electrons, protons, and α particles. At the same time, α cyclotron waves get excited via another decay instability. A pre-accelerated α particle resonates simultaneously with the two daughter waves, the SPA waves and the α cyclotron waves, and it is further accelerated perpendicular to the ambient magnetic field. The process may work in astrophysical environments where a sufficiently large temperature anisotropy of lower mass ions occurs.. |
| 30. | Oka, M.; Otsuka, F.; Matsukiyo, S.; Wilson, L. B., III; Argall, M. R.; Amano, T.; Phan, T. D.; Hoshino, M.; Le Contel, O.; Gershman, D. J.; Burch, J. L.; Torbert, R. B.; Dorelli, J. C.; Giles, B. L.; Ergun, R. E.; Russell, C. T.; Lindqvist, P. A., Electron Scattering by Low-frequency Whistler Waves at Earth’s Bow Shock, The Astrophysical Journal, 10.3847/1538-4357/ab4a81, 886, 1, 53(1)-53(11), 2019.11, [URL], Electrons are accelerated to nonthermal energies at shocks in space and astrophysical environments. While shock drift acceleration (SDA) has been considered a key process of electron acceleration at Earth’s bow shock, it has also been recognized that SDA needs to be combined with an additional stochastic process to explain the observed power-law energy spectra. Here, we show mildly energetic (∼0.5 keV) electrons are locally scattered (and accelerated while being confined) by magnetosonic-whistler waves within the shock transition layer, especially when the shock angle is large ({θ }Bn}≳ 70^\circ ). When measured by the Magnetospheric Multiscale mission at a high cadence, ∼0.5 keV electron flux increased exponentially in the shock transition layer. However, the flux profile was not entirely smooth and the fluctuation showed temporal/spectral association with large-amplitude (δ B/B∼ 0.3), low-frequency (≲ 0.1{{{Ω }}}ce} where {{{Ω }}}ce} is the cyclotron frequency), obliquely propagating ({θ }kB}∼ 30^\circ {--}60^\circ , where {θ }kB} is the angle between the wave vector and background magnetic field) whistler waves, indicating that the particles were interacting with the waves. Particle simulations demonstrate that, although linear cyclotron resonances with ∼0.5 keV electrons are unlikely due to the obliquity and low frequencies of the waves, the electrons are still scattered beyond 90° pitch angle by (1) resonant mirroring (transit-time damping), (2) non-resonant mirroring, and (3) subharmonic cyclotron resonances. Such coupled nonlinear scattering processes are likely to provide the stochasticity needed to explain the power-law formation.. |
| 31. | Otsuka, F.; Matsukiyo, S.; Hada, T., PIC Simulation of a quasi-parallel collisionless shock: Interaction between upstream waves and backstreaming ions, High Energy Density Physics, 10.1016/j.hedp.2019.100709, 33, 100709(1)-100709(10), 2019.11, [URL], We perform a one-dimensional full particle-in-cell (PIC) simulation of a quasi-parallel collisionless shock with the Alfvén Mach number 6.6 and a shock angle of 20 degrees between the upstream magnetic field and the shock normal direction. The backstreaming ions are self-consistently generated by reflections of the incoming ions at the shock. They generate the Alfvénic electromagnetic wave via the right-handed resonant ion-ion instability, as the ions travel toward the upstream region. The energy distribution of the backstreaming ions far upstream splits into two populations as it approaches the shock. The energy threshold of the populations is approximately the energy gained by a single specular reflection at the shock. The maximum energy of the backstreaming ions near the shock is about 10 times larger than the specularly reflected ion energy. Nonlinear phase bunches of the high-energy backstreaming ions and the background ions are found near the shock, due to the resonant and non-resonant trappings by the excited waves, respectively.. |
| 32. | Morita, T, Nagashima, K, Edamoto, M, Tomita, K, Sano, T, Itadani, Y, Kumar, R, Ota, M, Egashira, S, Yamazaki, R, Tanaka, S. J, Tomita, S, Tomiya, S, Toda, H, Miyata, I, Kakuchi, S, Sei, S, Ishizaka, N, Matsukiyo, S, Kuramitsu, Y. Ohira, Y, Hoshino, M, Sakawa, Y, Anomalous plasma acceleration in colliding high-power laser-produced plasmas, Physics of Plasmas, 10.1063/1.5100197, 26, 090702, 2019.10. |
| 33. | Morita, T.; Nagashima, K.; Edamoto, M.; Tomita, K.; Sano, T.; Itadani, Y.; Kumar, R.; Ota, M.; Egashira, S.; Yamazaki, R.; Tanaka, S. J.; Tomita, S.; Tomiya, S.; Toda, H.; Miyata, I.; Kakuchi, S.; Sei, S.; Ishizaka, N.; Matsukiyo, S.; Kuramitsu, Y.; Ohira, Y.; Hoshino, M.; Sakawa, Y., Anomalous plasma acceleration in colliding high-power laser-produced plasmas, Physics of Plasmas, 10.1063/1.5100197, 26, 9, 090702(1)-090702(6), 2019.09, [URL], We developed an experimental platform for studying magnetic reconnection in an external magnetic field with simultaneous measurements of plasma imaging, flow velocity, and magnetic-field variation. Here, we investigate the stagnation and acceleration in counterstreaming plasmas generated by high-power laser beams. A plasma flow perpendicular to the initial flow directions is measured by laser Thomson scattering. The flow is, interestingly, accelerated toward the high-density region, which is opposite to the direction of the acceleration by pressure gradients. This acceleration is possibly interpreted by the interaction of two magnetic field loops initially generated by the Biermann battery effect, resulting in a magnetic reconnection forming a single field loop and additional acceleration by a magnetic tension force.. |
| 34. | Bolouki, N.; Sakai, K.; Huang, T. Y.; Isayama, S.; Liu, Y. L.; Peng, C. W.; Chen, C. H.; Khasanah, N.; Chu, H. H.; Moritaka, T.; Tomita, K.; Sato, Y.; Uchino, K.; Morita, T.; Matsukiyo, S.; Hara, Y.; Shimogawara, H.; Sakawa, Y.; Sakata, S.; Kojima, S.; Fujioka, S.; Shoji, Y.; Tomiya, S.; Yamazaki, R.; Koenig, M.; Kuramitsu, Y., Collective Thomson scattering measurements of electron feature using stimulated Brillouin scattering in laser-produced plasmas, High Energy Density Physics, 10.1016/j.hedp.2019.06.002, 32, 82-88, 2019.07, [URL], Collective Thomson scattering (CTS) has been applied to laser-produced plasmas with Gekko XII HIPER laser facility. A scheme of stimulated Brillouin scattering (SBS) has been used in CTS measurements for the first time. Utilizing SBS shortens the probe pulse, which increases the scattered power, and thus collected scattered signal of CTS. Therefore, a lower energy probe laser can be used for given background emission levels to avoid probe heating, which is crucial for plasmas with low electron temperature. Both electron and ion features of CTS have been successfully detected by using the SBS technique. The spatial profile of electron density, temperature, and drift velocity have been estimated in an ablation plasma. In addition to the local measurements with CTS, a global structure of plasmas has been obtained with optical imaging of the self-emission of plasmas and the interferometry. In the aspects of drift velocity and plasma density, the local and global information are in good agreement.. |
| 35. | Niemiec J, Kobzar O, Amano T, Hoshino M, Matsukiyo S, Matsumoto Y, Pohl M, Electron Acceleration at Rippled Low Mach Number Shocks in Merging Galaxy Clusters, 36th International Cosmic Ray Conference (ICRC2019), 2019.07, [URL]. |
| 36. | Collective Thomson scattering measurements of electron feature using stimulated Brillouin scattering in laser-produced plasmas © 2019 Collective Thomson scattering (CTS) has been applied to laser-produced plasmas with Gekko XII HIPER laser facility. A scheme of stimulated Brillouin scattering (SBS) has been used in CTS measurements for the first time. Utilizing SBS shortens the probe pulse, which increases the scattered power, and thus collected scattered signal of CTS. Therefore, a lower energy probe laser can be used for given background emission levels to avoid probe heating, which is crucial for plasmas with low electron temperature. Both electron and ion features of CTS have been successfully detected by using the SBS technique. The spatial profile of electron density, temperature, and drift velocity have been estimated in an ablation plasma. In addition to the local measurements with CTS, a global structure of plasmas has been obtained with optical imaging of the self-emission of plasmas and the interferometry. In the aspects of drift velocity and plasma density, the local and global information are in good agreement.. |
| 37. | Umeda,T.; Yamazaki,R.; Ohira,Y.; Ishizaka,N.; Kakuchi,S.; Kuramitsu,Y.; Matsukiyo,S.; Miyata,I.; Morita,T.; Sakawa,Y.; Sano.T.; Sei,S.; Tanaka,S.J.; Toda,H. Tomita,S., Full particle-in-cell simulation of the interaction between two plasmas for laboratory experiments on the generation of magnetized collisionless shocks with high-power lasers, Physics of Plasmas, 10.1063/1.5079906, 26, 3, 032303(1)-032303(12), 2019.03, [URL], A preliminary numerical experiment is conducted for laboratory experiments on the generation of magnetized collisionless shocks with high-power lasers by using one-dimensional particle-in-cell simulation. The present study deals with the interaction between a moving aluminum plasma and a nitrogen plasma at rest. In the numerical experiment, the nitrogen plasma is unmagnetized or magnetized by a weak external magnetic field. Since the previous study suggested the generation of a spontaneous magnetic field in the piston (aluminum) plasma due to the Biermann battery, the effect of the magnetic field is of interest. Sharp jumps of the electron density and magnetic field are observed around the interface between the two plasmas as long as one of the two plasmas is magnetized, which indicates the formation of tangential electron-magneto-hydro-dynamic discontinuity. When the aluminum plasma is magnetized, strong compression of both the density and the magnetic field takes place in the pure aluminum plasma during the gyration of nitrogen ions in the aluminum plasma region. The formation of a shock downstream is obtained from the shock jump condition. The results suggest that the spontaneous magnetic field in the piston (aluminum) plasma plays an essential role in the formation of a perpendicular collisionless shock.. |
| 38. | Umeda Takayuki, Yamazaki Ryo, Ohara Yutaka, Ishizaka Natsuki, Kakuchi Shin, Kuramitsu Yasuhiro, Matsukiyo Shuichi, Miyata Itaru, Morita Taichi, Sakawa Youichi, Sano Takayoshi, Sei Shuto, Tanaka Shuta J, Toda Hirohumi, Tomita Sara, Full particle-in-cell simulation of the interaction between two plasmas for laboratory experiments on the generation of magnetized collisionless shocks with high-power lasers, PHYSICS OF PLASMAS, 10.1063/1.5079906, 26, 3, 2019.03. |
| 39. | Kuramitsu,Y.; Moritaka,T.; Sakawa,Y.; Morita,T.; Sano,T.; Koenig,M.; Gregory,C.D.; Woolsey,N.; Tomita,K.; Takabe,H.; Liu,Y.L.; Chen,S.H.; Matsukiyo,S.; Hoshino,M., Magnetic reconnection driven by electron dynamics, Nature Communications, 10.1038/s41467-018-07415-3, 9, 5109(1)-5109(6), 2018.11, [URL], Magnetic reconnections play essential roles in space, astrophysical, and laboratory plasmas, where the anti-parallel magnetic field components re-connect and the magnetic energy is converted to the plasma energy as Alfvénic out flows. Although the electron dynamics is considered to be essential, it is highly challenging to observe electron scale reconnections. Here we show the experimental results on an electron scale reconnection driven by the electron dynamics in laser-produced plasmas. We apply a weak-external magnetic field in the direction perpendicular to the plasma propagation, where the magnetic field is directly coupled with only the electrons but not for the ions. Since the kinetic pressure of plasma is much larger than the magnetic pressure, the magnetic field is distorted and locally anti-parallel. We observe plasma collimations, cusp and plasmoid like features with optical diagnostics. The plasmoid propagates at the electron Alfvén velocity, indicating a reconnection driven by the electron dynamics.. |
| 40. | Kis A, Matsukiyo S, Otsuka F, Hada T, Lemperger I, Dandouras I, Barta V, Facsko G, Effect of upstream ULF waves on the energetic ion fiffusion at the Earth's foreshock: II. Observations, The Astrophysical Journal, 10.3847/1538-4357/aad08c, 863, 136(1)-136(9), 2018.08, [URL], This study reports observations of energetic ions upstream of the Earth’s quasi-parallel bow shock by Cluster at times when interspacecraft separation distances were large. We analyze two individual upstream ion events during high solar wind velocity conditions to compare the spatial evolution of partial energetic ion densities in front of the Earth’s bow shock along the magnetic field line. Using a bow shock model, we determine the distance of SC1 and SC3 to the bow shock surface parallel to the magnetic field. The CIS-HIA instrument on board Cluster provides partial energetic ion densities in four energy channels between 10 and 32 keV. Using the differences of the partial energetic ion densities observed on SC1 and SC3, and the distances of the spacecraft to the bow shock, we determine the spatial gradient of partial energetic ion densities at various distances from the bow shock. We show, for the first time, that the e-folding distance and the diffusion coefficient of the diffuse ions become unusually small when these ions interact with high-intensity waves generated by a strong field-aligned beam.. |
| 41. | Otsuka F, Matsukiyo S, Hada T, Effect of field-aligned beam on upstream wave excitation and particle scattering in the earth's foreshock: One-dimensional PIC simulation, 35th International Cosmic Ray Conference. 10-20 July, 2017. Bexco, Busan, Korea, Proceedings of Science, 10.22323/1.301.0078, 301, 78(1)-78(5), 2018.03, [URL], The Earth’s foreshock extends to a large domain of upstream quasi-parallel bow shock, and is characterized by a presence of field-aligned beams (FABs), diffuse ions, ultra-low frequency (ULF) waves, high frequency whistler waves, shocklets, and so on. Kinetic self-consistent numerical simulation is one of the key tools to analyze detailed physics of the foreshock which has not been clearly understood. Because of the necessity of the large simulation domain, a full particle-in-cell (PIC) simulation of quasi-parallel shock has seldom been performed. In this paper we show preliminary results of a long-term and large-scale one-dimensional full PIC simulation of the quasi-parallel collisionless shock with the Alfvén Mach number 6.6 and shock angle 20 degrees. The FAB component is observed far upstream with the beam velocity of 10.5 times the Alfvén velocity and the beam density of 0.5 % of the background plasma. This FAB generates right-handed Alfvén waves in the plasma rest frame via resonant mode instability, and the excited waves are amplified as approaching the shock during the plasma convection. The number densities of energetic particles for both electrons and ions also increase as approaching the shock.. |
| 42. | 中野谷賢, 羽田 亨, Shuichi Matsukiyo, Diffusive shock acceleration of cosmic rays from two stationary shocks, Earth, Planets and Space, 10.1186/s40623-018-0799-3, 70, 33(1)-33(6), 2018.02, [URL], Diffusive shock acceleration (Fermi acceleration) of cosmic rays in a system containing two shock waves is investigated using test particle simulations and analysis of the diffusion convection equation. We assume that the cosmic ray acceleration timescale is much less than the approaching timescale of the two shocks. Low-energy cosmic rays are primarily accelerated as they interact with one of the two shocks. However, as they are energized, and their mean free path becomes comparable to the separation distance of the two shocks, they start to accelerate as they interact with both shocks. As a result, a double power-law-type spectrum for the cosmic ray distribution is produced. The numerical result is well explained by a model based on the diffusion convection equation, which accounts for the dependence of the diffusion coefficient on the cosmic ray energy. The break point of the spectrum can be estimated by considering transport of cosmic rays from one shock to the other.. |
| 43. | Otsuka,F.; Matsukiyo,S.; Kis,A.; Nakanishi,K.; Hada,T., Effect of upstream ULF waves on the energetic ion fiffusion at the Earth's foreshock: I. Theory and simulation, The Astrophysical Journal, 10.3847/1538-4357/aa8363, 853, 117(1)-117(11), 2018.01, [URL], Field-aligned diffusion of energetic ions in the Earth’s foreshock is investigated by using the quasi-linear theory (QLT) and test particle simulation. Non-propagating MHD turbulence in the solar wind rest frame is assumed to be purely transverse with respect to the background field. We use a turbulence model based on a multi-power-law spectrum including an intense peak that corresponds to upstream ULF waves resonantly generated by the field-aligned beam (FAB). The presence of the ULF peak produces a concave shape of the diffusion coefficient when it is plotted versus the ion energy. The QLT including the effect of the ULF wave explains the simulation result well, when the energy density of the turbulent magnetic field is 1% of that of the background magnetic field and the power-law index of the wave spectrum is less than 2. The numerically obtained e-folding distances from 10 to 32 keV ions match with the observational values in the event discussed in the companion paper, which contains an intense ULF peak in the spectra generated by the FAB. Evolution of the power spectrum of the ULF waves when approaching the shock significantly affects the energy dependence of the e-folding distance.. |
| 44. | 中野谷賢, Shuichi Matsukiyo, 羽田 亨, Christian X. Mazelle, Electromagnetic structure and electron acceleration in shock-shock interaction, The Astrophysical Journal, 10.3847/1538-4357/aa8363, 846, 113(1)-113(7), 2017.09, [URL], A shock-shock interaction is investigated by using a one-dimensional full particle-in-cell simulation. The simulation reproduces the collision of two symmetrical high Mach number quasi-perpendicular shocks. The basic structure of the shocks and ion dynamics is similar to that obtained by previous hybrid simulations. The new aspects obtained here are as follows. Electrons are already strongly accelerated before the two shocks collide through multiple reflection. The reflected electrons self-generate waves upstream between the two shocks before they collide. The waves far upstream are generated through the right-hand resonant instability with the anomalous Doppler effect. The waves generated near the shock are due to firehose instability and have much larger amplitudes than those due to the resonant instability. The high-energy electrons are efficiently scattered by the waves so that some of them gain large pitch angles. Those electrons can be easily reflected at the shock of the other side. The accelerated electrons form a power-law energy spectrum. Due to the accelerated electrons, the pressure of upstream electrons increases with time. This appears to cause the deceleration of the approaching shock speed. The accelerated electrons having sufficiently large Larmor radii are further accelerated through the similar mechanism working for ions when the two shocks are colliding.. |
| 45. | Khasanah,N.; Peng,C.W.; Chen,C.H.; Huang,T.Y.; Bolouki,N.; Moritaka,T.; Hara,Y.; Shimogawara,H.; Sano,T.; Sakawa,y.; Sato,Y.; Tomita,K.; Uchino,K.; Matsukiyo,S.; Shoji,Y.; Tomita,S.; Tomiya,S.; Yamazaki,R.; Koenig,M.; Kuramitsu,Y., Spatial and temporal plasma evolutions of magnetic reconnection in laser produced plasmas, High Energy Density Physics, 10.1016/j.hedp.2017.02.004, 23, 15-19, Vol.23,15, 2017.06, [URL], Magnetic reconnection is experimentally investigated in laser produced plasmas. By irradiating a solid target with a high-power laser beam, a magnetic bubble is generated due to the Biermann effect. When two laser beams with finite focal spot displacements are utilized, two magnetic bubbles are generated, and the magnetic reconnection can take place. We measure the spatial and temporal plasma evolutions with optical diagnostics using framing camera. We observed the plasma jets, which are considered to be reconnection out flows. Spatial and temporal scales of the plasma jets are much larger than those of laser. The magnetic reconnection time has been estimated from the expansion velocity, which is consistent with the Sweet-Parker model.. |
| 46. | Kuramitsu,Y.; Mizuta,A.; Sakawa,Y.; Tanji,H.; Ide,T.; Sano,T.; Koenig,M.; Ravasio,A.; Pelka,A.; Takabe,H.; Gregory,C.D.; Woolsey,N.; Moritaka,T.; Matsukiyo,S.; Matsumoto,Y.; Ohnishi,N., Time evolution of Kelvin-Helmholtz vortices associated with collisionless shocks in laser-produced plasmas, Astrophysical Journal, 10.3847/0004-637X/828/2/93, 828, 93(1)-93(10), Vol.828, 93, 2016.09, [URL], We report experimental results on Kelvin-Helmholtz (KH) instability and resultant vortices in laser-produced plasmas. By irradiating a double plane target with a laser beam, asymmetric counterstreaming plasmas are created. The interaction of the plasmas with different velocities and densities results in the formation of asymmetric shocks, where the shear flow exists along the contact surface and the KH instability is excited. We observe the spatial and temporal evolution of plasmas and shocks with time-resolved diagnostics over several shots. Our results clearly show the evolution of transverse fluctuations, wavelike structures, and circular features, which are interpreted as the KH instability and resultant vortices. The relevant numerical simulations demonstrate the time evolution of KH vortices and show qualitative agreement with experimental results. Shocks, and thus the contact surfaces, are ubiquitous in the universe; our experimental results show general consequences where two plasmas interact.. |
| 47. | Y. Kuramitsu, A. Mizuta, Y. Sakawa, H. Tanji, T. Ide, T. Sano, M. Koenig, A. Ravasio, A. Pelka, H. Takabe, C. D. Gregory, N. Woolsey, T. Moritaka, S. Matsukiyo, Y. Matsumoto, N. Ohnishi, TIME EVOLUTION OF KELVIN-HELMHOLTZ VORTICES ASSOCIATED WITH COLLISIONLESS SHOCKS IN LASER-PRODUCED PLASMAS, ASTROPHYSICAL JOURNAL, 10.3847/0004-637X/828/2/93, 828, 2, 2016.09, We report experimental results on Kelvin-Helmholtz (KH) instability and resultant vortices in laser-produced plasmas. By irradiating a double plane target with a laser beam, asymmetric counterstreaming plasmas are created. The interaction of the plasmas with different velocities and densities results in the formation of asymmetric shocks, where the shear flow exists along the contact surface and the KH instability is excited. We observe the spatial and temporal evolution of plasmas and shocks with time-resolved diagnostics over several shots. Our results clearly show the evolution of transverse fluctuations, wavelike structures, and circular features, which are interpreted as the KH instability and resultant vortices. The relevant numerical simulations demonstrate the time evolution of KH vortices and show qualitative agreement with experimental results. Shocks, and thus the contact surfaces, are ubiquitous in the universe; our experimental results show general consequences where two plasmas interact.. |
| 48. | Y. Sakawa, Y. Hara, H. Shimogawara, R. Kumar, Y. Sano, S. Fujioka, K. Tomita, K. Uchino, T. Morita, S. Matsukiyo, R. Yamazak, T. Moritaka, Y. Kuramitsu, R. Crowston, N. Woolsey, B. Albertazzi, M. Koeing, L. Van, Box Som, E. Falize, C. Michaut, P. Barroso, Y. T. Li, X. Pei, H. Wei, J. Y. Zhong, H. Sakagami, H. Takabe, Electrostatic collisionless shock in laser-produced counter-streaming plasmas, 2016.05. |
| 49. | A. Ishii, N. Ohnishi, R. Yamazaki, Y. Shoji, S. Tomiya, Y. Sakawa, Y. Hara, H. Shimogawara, S. Matsukiyo, T. Morita, K. Tomita, S. Tanaka, Y. Teraki, Radiation Magneto-Hydrodynamics Simulations for Laser- Produced Collisionless Shock Experiment, 2016.05. |
| 50. | Shuichi Matsukiyo, 蔵満康浩, KENTARO TOMITA, Collective scattering of an incident monochromatic circularly polarized wave in an unmagnetized non-equilibrium plasma, Journal of Physics: Conference Series, 10.1088/1742-6596/688/1/012062, 688, 012062(1)-012062(4), Vol.688, 012062, 2016.04, [URL]. |
| 51. | 蔵満康浩, Shuichi Matsukiyo, Shogo Isayama, D. Harada, T. Oyama, R. Fujino, Youichi Sakawa, Taichi Morita, Y. Yamaura, T. Ishikawa, Toseo Moritaka, Takayoshi Sano, KENTARO TOMITA, R. Shimoda, Y. Sato, Kiichiro Uchino, A. Pelka, R. Crowston, N. Woolsey, Spherical shock in the presence of an external magnetic field, Journal of Physics: Conference Series, 10.1088/1742-6596/688/1/012056, 688, 012056(1)-012056(5), Vol.688, 012056, 2016.04, [URL]. |
| 52. | T. Ishikawa, Youichi Sakawa, Taichi Morita, Y. Yamaura, 蔵満康浩, Toseo Moritaka, Takayoshi Sano, R. Shimoda, KENTARO TOMITA, Kiichiro Uchino, Shuichi Matsukiyo, Akira Mizuta, Naofumi Ohnishi, R. Crowston, N. Woolsey, H. Doyle, G. Gregori, M. Koenig, C. Michaut, Thomson scattering measurement of a collimated plasma jet generated by a high-power laser system, Journal of Physics: Conference Series, 10.1088/1742-6596/688/1/012098, 688, 012098(1)-012098(5), Vol.688, 012098, 2016.04, [URL]. |
| 53. | Yoshitaka Shoji, Ryo Yamazaki, Sara Tomita, Yushiro Kawamura, Yutaka Ohira, Satoshi Tomiya, Youichi Sakawa, Takayoshi Sano, Yukiko Hara, Sarana Kondo, Hiroshi Shimogawara, Shuichi Matsukiyo, 森田 太智, 富田 健太郎, Hitoki Yoneda, Kazunori Nagamine, Yasuhiro Kuramitsu, Toseo Moritaka, Naofumi Ohnishi, Toward the generation of magnetized collisionless shocks with high-power lasers, Plasma and Fusion Research, 10.1585/pfr.11.3401031, 11, 3401031-1-3401031-3, 2016.04, [URL]. |
| 54. | T. Ishikawa, Y. Sakawa, T. Morita, Y. Yamaura, Y. Kuramitsu, T. Moritaka, T. Sano, R. Shimoda, K. Tomita, K. Uchino, S. Matsukiyo, A. Mizuta, N. Ohnishi, R. Crowston, N. Woolsey, H. Doyle, G. Gregori, M. Koenig, C. Michaut, A. Pelka, D. Yuan, Y. Li, K. Zhang, J. Zhong, F. Wang, H. Takabe, Thomson scattering measurement of a collimated plasma jet generated by a high-power laser system, 8TH INTERNATIONAL CONFERENCE ON INERTIAL FUSION SCIENCES AND APPLICATIONS (IFSA 2013), 10.1088/1742-6596/688/1/012098, 688, 012098-012098, 2016.04, One of the important and interesting problems in astrophysics and plasma physics is collimation of plasma jets. The collimation mechanism, which causes a plasma flow to propagate a long distance, has not been understood in detail. We have been investigating a model experiment to simulate astrophysical plasma jets with an external magnetic field [Nishio et al., EPJ. Web of Conferences 59, 15005 (2013)]. The experiment was performed by using Gekko XII HIPER laser system at Institute of Laser Engineering, Osaka University. We shot CH plane targets (3 mm x 3 mm x 10 mu m) and observed rear-side plasma flows. A collimated plasma flow or plasma jet was generated by separating focal spots of laser beams. In this report, we measured plasma jet structure without an external magnetic field with shadowgraphy, and simultaneously measured the local parameters of the plasma jet, i.e., electron density, electron and ion temperatures, charge state, and drift velocity, with collective Thomson scattering.. |
| 55. | SHOJI Yoshitaka, YAMAZAKI Ryo, TOMITA Sara, KAWAMURA Yushiro, OHIRA Yutaka, TOMIYA Satoshi, SAKAWA Yoichi, SANO Takayoshi, HARA Yukiko, KONDO Sarana, SHIMOGAWARA Hiroshi, MATSUKIYO Shuichi, MORITA Taichi, TOMITA Kentaro, YONEDA Hitoki, NAGAMINE Kazunori, KURAMITSU Yasuhiro, MORITAKA Toseo, OHNISHI Naofumi, UMEDA Takayuki, TAKABE Hideaki, Toward the Generation of Magnetized Collisionless Shocks with High-Power Lasers , Plasma and Fusion Research, 10.1585/pfr.11.3401031, 11, 0, 3401031-3401031, 2016.04, We have started a project of experimental generation of low Mach number collisionless shocks propagating into magnetized plasma, using high power lasers such as Gekko XII at Institute of laser engineering, Osaka University. We briefly present a result of our first experiments done in September 2014, in which Aluminum plane target was irradiated by main laser in ambient Helium gas with external magnetic field. Ejected Aluminum plasma had a bulk velocity of 430 km s−1, which is sufficient enough to excite the magnetized collisionless shock in our experimental setup. However, the ejected Aluminum plasma was decelerated before the shock was excited. . |
| 56. | Kuramitsu,Y.; Ohnishi,N.; Sakawa,Y.; Morita,T.; Tanji,H.; Ide,T.; Nishio,K.; Gregory,C.D.; Waugh,J.N.; Booth,N.; Heathcote,R.; Murphy,C.; Gregori,G.; Smallcombe,J.; Barton,C.; Diziere,A.; Koenig,M.; Woolsey,N.; Matsumoto,Y.; Mizuta,A.; Sugiyama,T.; Matsukiyo,S.; Moritaka,T.; Sano,T.; Takabe,H., Model experiment of magnetic field amplification in laser-produced plasmas via the Richtmyer-Meshkov instability, Physics of Plasmas, https://doi.org/10.1063/1.4944925, 23, 032126(1)-032126(6), Vol.23, 032126, 2016.03, [URL]. |
| 57. | Model experiment of magnetic field amplification in laser-produced plasmas via the Richtmyer-Meshkov instability. |
| 58. | Shuichi Matsukiyo, Yosuke Matsumoto, Electron Acceleration at a High Beta and Low Mach Number Rippled Shock, Journal of Physics: Conference Series, 10.1088/1742-6596/642/1/012017, 642, 012017(1)-012017(7), Vol.642, 012017, 2015.09, [URL]. |
| 59. | Electron Acceleration at a High Beta and Low Mach Number Rippled Shock. |
| 60. | M. Nakanotani, S. Matsukiyo, T. Hada, Y. Sakawa, Y. Kuramitsu, T. Morita, K. Tomita, R. Fujino, S. Kubo, T. Sano, T. Moritaka, Y. Hara, R. Yamazaki, H. Takabe, High Power Laser Experiment of Planar Collisionless Shocks, 2015.04. |
| 61. | Y. Sakawa, T Morita, Y. Yamaura, T. Ishikawa, K. Tomita, R. Crowston, R. Fujino, G. Gregori, C. Huntington, D. Harada, S. Isayama, N. Kugland, Z. Kai, M. Koenig, Y. Kuramitsu, Y- T. Li, S. Matsukiyo, C. Michaut, T. Moritaka, K. Nagamine, T. Oyama, H. S. Park, A. Pelka, B. Remington, T. Sano, Y. Sato, R. Shimoda, A. Spitkovsky, T. Wadagaki, N. Woolsey, C. Yin, H. Yoneda, D. Yuan, R. Yurchak, Z. Zhang, J. Zhong, H. Takabe, Collisionless shock experiments using large-scale lasers, 2014.05. |
| 62. | Taichi MORITA, Youichi Sakawa, Kentaro Tomita, Robert Crowston, Ryosuke Fujino, Daisuke Harada, Shogo Isayama, Taishi Ishikawa, Kai Zhang, Michel Koenig, Yasuhiro Kuramitsu, Yutong Li, Shuichi Matsukiyo, Claire Michaut, Toseo Moritaka, Kazuyoshi Nagamine, Tatsuya Oyama, Alexander Pelka, Takayoshi Sano, Yuta Sato, Ryo Shimoda, Tomoya Wadagaki, Nigel Woolsey, Yuta Yamaura, Chuanlei Yin, Hitoki Yoneda, Dawei Yuan, Roman Yurchak, Zhang Zhe, Jiayong Zhong, Hideaki Takabe, Experimental study on jet formation and propagation by use of Gekko-XII laser system, 2014.05. |
| 63. | Shuichi Matsukiyo, Manfred Scholer, Simulations of pickup ion mediated quasi-perpendicular shocks: Implications for the heliospheric termination shock, Journal of Geophysical Research, 10.1002/2013JA019654, 119, 2014.04. |
| 64. | Shuichi Matsukiyo, Manfred Scholer, Simulations of pickup ion mediated quasi-perpendicular shocks: Implications for the heliospheric termination shock, Journal of Geophysical Research: Space Physics, 10.1002/2013JA019654, 119, 4, 2388-2399, 2014.04, The microstructure of the heliospheric termination shock and the accompanied local acceleration processes of both ions and electrons are investigated by utilizing one-dimensional full particle-in-cell simulations for a variety of parameters. The relative pickup ion density is assumed to be 20-30%. The magnetic field and the shock potential profiles exhibit significant differences, since the former mostly reflects the dynamics of solar wind ions, whereas the latter is mainly sustained by the bulk motion of the reflected pickup ions in the extended foot. The discrepancy between the magnetic field profile and the potential profile increases with Alfvén Mach number. Most of the downstream thermal energy is gained by the pickup ions, while some heating of the solar wind ions and electrons occurs through the modified two-stream instability excited in the extended foot. Self-reformation can occur when the relative pickup ion density is 20% but is blurred when it becomes as large as 30%. Reformation is also suppressed if the local solar wind ion temperature in the extended foot is high, which can either be due to heating by the modified two-stream instability or is already determined by the solar wind temperature far upstream. In all runs presented in this study no evidence for shock surfing acceleration of pickup ions could be found. Nonthermal particle acceleration occurs for oblique shocks. Electron (pickup ion) shock drift acceleration is evidenced when the shock angle is below 80° (60°). Key Points Parameter dependences of microstructures of the termination shock are examined Profiles of magnetic field and potential show significant differences Shock drift acceleration mechanism works for both electrons and pickup ions ©2014. American Geophysical Union. All Rights Reserved.. |
| 65. | 中野谷賢, Shuichi Matsukiyo, 羽田 亨, Full particle-in-cell simulation of two colliding shocks, Proceedings of the 12th Asia Pacific Physics Conference (JPS Conference Proceedings), 10.7566/JPSCP.1.015103, 1, 015103-1-015103-5, 2014.03, [URL]. |
| 66. | Takayuki Umeda, Yoshitaka Kidani, Shuichi Matsukiyo, Ryo Yamazaki, Dynamics and microinstabilities at perpendicular collisionless shock: A comparison of large-scale two-dimensional full particle simulations with different ion to electron mass ratio, Physics of Plasmas, 10.1063/1.4863836, 21, 2, 022102-1-022102-10, vol.21, issue 2, 022102, 2014.02, [URL]. |
| 67. | Y. Sakawa, Y. Kuramitsu, T. Morita, T. Ishikawa, Y. Yamaura, T. Moritaka, T. Sano, H.Takabe, R. Shimoda, K. Tomita, K. Uchino, S. Matsukiyo, A. Mizuta, N. Ohnishi, R. Crowston, N. Woolsey, H. Doyle, G. Gregori, A. Ravasio, A. Pelka, M. Koenig, C. Michaut, D. Yuan, Y. Li, K. Zhang, J. Zhong, F. Wang, A. Spitkovsky, N. L. Kugland, J. S. Ross, H.-S. Park, B. Remington, Laboratory astrophysical experiments using Gekko XII laser system, 2013.08. |
| 68. | S. Matsukiyo, M. Scholer, Dynamics of energetic electrons in nonstationary quasi-perpendicular shocks, Journal of Geophysical Research, 10.1029/2012JA017986, 117, A11, A11105, vol.117, A11, A11105, 2012.11, [URL]. |
| 69. | Shuichi Matsukiyo, Manfred Scholer, Dynamics of energetic electrons in nonstationary quasi-perpendicular shocks, Journal of Geophysical Research: Space Physics, 10.1029/2012JA017986, 117, 11, 2012.11, A one-dimensional full particle-in-cell (PIC) code is utilized to investigate energetic electron bursts produced at a nonstationary quasi-perpendicular shock. A number of electrons are intermittently energized by interacting with nonstationary electromagnetic fields in the shock front. Some of the energetic electrons are reflected at the shock and form an upstream non-thermal population. The reflection process is strongly affected by the non-coplanar magnetic field component which is temporarily rather strong in the transition region of a highly nonstationary shock. Oblique whistler waves in the transition region influence the distribution function of the reflected electrons. Waves excited by the modified two-stream instability may pitch angle scatter the electrons and thus blur the loss cone feature of the reflected electrons. Dispersive standing whistler waves are also emitted locally in the foot even when a Mach number exceeds a critical value. These whistler waves may also scatter the electrons to blur the loss cone. Furthermore, the whistler waves produce clumps of the reflected electrons in a phase space. Some electrons are trapped by the ion holes produced downstream as a remnant of a self-reformation process of the shock front and accelerated through a drift mechanism. It is also discussed how physical quantities associated with the reflected electrons observed upstream of the shock can give information about the shock front nonstationarity as well as about local small scale wave activities in the transition region. © 2012 American Geophysical Union. All Rights Reserved.. |
| 70. | Takayuki Umeda, Shuichi Matsukiyo, Takanobu Amano, Yoshizumi Miyoshi, A numerical electromagnetic linear dispersion relation for Maxwellian ring-beam velocity distributions, Physics of Plasmas, 10.1063/1.4736848, 19, 7, 072107, vol.19, issue 7, 072107, 2012.07, [URL]. |
| 71. | Takayuki Umeda, Yoshitaka Kidani, Shuichi Matsukiyo, Ryo Yamazaki, Microinstabilities at perpendicular collisionless shocks: A comparison of full particle simulations with different ion to electron mass ratio, Physics of Plasmas, 10.1063/1.3703319, 19, 4, 042109, vol.19, issue 4, 042109, 2012.04, [URL]. |
| 72. | Terasawa Toshio, Matsukiyo Shuichi, Cyclotron Resonant Interactions in Cosmic Particle Accelerators, Space Science Reviews, 10.1007/s11214-012-9878-0, 2012.04, [URL]. |
| 73. | Takayuki Umeda, Yoshitaka Kidani, Shuichi Matsukiyo, Ryo Yamazaki, Modified two-stream instability at perpendicular collisionless shocks: Full particle simulations, Journal of Geophysical Research, 10.1029/2011JA017182, 117, A3, A03206, vol.117, Issue A3, CiteID A03206, 2012.03, [URL]. |
| 74. | Shuichi Matsukiyo, Yutaka Ohira, Ryo Yamazaki, Takayuki Umeda, Relativistic Electron Shock Drift Acceleration in Low Mach Number Galaxy Cluster Shocks, Astrophysical Journal, 10.1088/0004-637X/742/1/47, 742, Issue 1, article id. 47, vol.742, article id. 47, 2011.11, [URL]. |
| 75. | Matsukiyo Shuichi, Ohira Yutaka, Yamazaki Ryo, Umeda Takayuki, RELATIVISTIC ELECTRON SHOCK DRIFT ACCELERATION IN LOW MACH NUMBER GALAXY CLUSTER SHOCKS, Astrophysical Journal, 10.1088/0004-637X/742/1/47, 742, 47-47, 2011.11, An extreme case of electron shock drift acceleration (SDA) in lowMach number collisionless shocks is investigated as a plausible mechanism for the initial acceleration of relativistic electrons in large-scale shocks in galaxy clusters, where the upstream plasma temperature is of the order of 10 keV and the degree of magnetization is not too small. One-dimensional electromagnetic full particle simulations reveal that, even when a shock is rather moderate, a part of the thermal incoming electrons are accelerated and reflected through relativistic SDA and form a local non-thermal population just upstream of the shock. The accelerated electrons can self-generate local coherent waves and further be back-scattered toward the shock by those waves. This may be a scenario for the first stage of the electron shock acceleration occurring at the large-scale shocks in galaxy clusters, such as CIZA J2242.8+5301, which have well-defined radio relics.. |
| 76. | S. Matsukiyo, M. Scholer, Microstructure of the heliospheric termination shock: Full particle electrodynamic simulations, Journal of Geophysical Research, 10.1029/2011JA016563, 116, A8, A08106, vol.116, A8, A08106, 2011.08, [URL]. |
| 77. | Shuichi Matsukiyo, Manfred Scholer, Microstructure of the heliospheric termination shock: Full particle electrodynamic simulations, Journal of Geophysical Research: Space Physics, 10.1029/2011JA016563, 116, 8, 2011.08, A particle-in-cell code is used to examine kinetic properties of pickup ions at the heliospheric termination shock. The code treats the pickup ions self-consistently as a third component. The simulations are one-dimensional in spatial variations. We use a relative pickup ion density of 30% and two different values of the magnetic field-shock normal angle: Bn = 90 and Bn = 87. The oblique shock is chosen in order to allow for wave vectors parallel to the magnetic field due to instabilities in the foot. In addition, a run is presented with a 60% relative pickup ion density to investigate a pickup ion-dominated shock. Upstream of the ramp is an extended foot due to reflected pickup ions. In this foot the magnetic field continuously increases, and the bulk speed of the pickup ions as well as the bulk speed of the solar wind ions decrease and reach at the magnetic field ramp the downstream value. The positive bulk velocity of the pickup ions in the extended foot perpendicular to the magnetic field and to the shock normal causes an electric field in the shock normal direction. This leads to a large increase of the shock potential well upstream of the magnetic field ramp. The maximum value of the potential is ∼0.35 the shock ram energy and is by a factor 5 larger than expected for a weak shock without pickup ions. Pickup ion reflection at the shock is almost 100% part of the pickup ions are essentially specularly reflected by the magnetic field force term of the Lorentz force in the overshoot and part of the pickup ions are reflected in the extended foot due to a combination of the magnetic force term and the cross-shock potential. In the 30% pickup ion case, about 90% of the total thermal energy gain in the shock is gained by pickup ions, a little under 10% by the solar wind ions. The thermal energy gain by pickup ions increases as the pickup ion relative density increases. The pickup ion temperature increases continuously from the upstream edge of the extended foot to the shock ramp and then stays constant through the overshoot and downstream. Copyright © 2011 by the American Geophysical Union.. |
| 78. | Horia Comisel, Manfred Scholer, Jan Soucek, Shuichi Matsukiyo, Non-stationarity of the quasi-perpendicular bow shock: comparison between Cluster observations and simulations, Annales Geophysicae, 10.5194/angeo-29-263-2011, 29, Issue 2, 263-274, vol.29, Issue 2, pp.263-274, 2011.02, [URL]. |
| 79. | H. Comisel, M. Scholer, J. Soucek, S. Matsukiyo, Non-stationarity of the quasi-perpendicular bow shock: comparison between Cluster observations and simulations, ANNALES GEOPHYSICAE, 10.5194/angeo-29-263-2011, 29, 2, 263-274, 2011.02, We have performed full particle electromagnetic simulations of a quasi- perpendicular shock. The shock parameters have been chosen to be appropriate for the quasiperpendicular Earth's bow shock observed by Cluster on 24 January 2001 (Lobzin et al., 2007). We have performed two simulations with different ion to electron mass ratio: run 1 with m(i)/m(e) = 1840 and run 2 with m(i)/m(e) = 100. In run 1 the growth rate of the modified two- stream instability (MTSI) is large enough to get excited during the reflection and upstream gyration of part of the incident solar wind ions. The waves due to the MTSI are on the whistler mode branch and have downstream directed phase velocities in the shock frame. The Poynting flux (and wave group velocity) far upstream in the foot is also directed in the downstream direction. However, in the density and magnetic field compression region of the overshoot the waves are refracted and the Poynting flux in the shock frame is directed upstream. The MTSI is suppressed in the low mass ratio run 2. The low mass ratio run shows more clearly the non-stationarity of the shock with a larger time scale of the order of an inverse ion gyrofrequency (Omega(ci)): the magnetic field profile flattens and steepens with a period of similar to 1.5 Omega(-1)(ci). This non-stationarity is different from reformation seen in previous simulations of perpendicular or quasi-perpendicular shocks. Beginning with a sharp shock ramp the large electric field in the normal direction leads to high reflection rate of solar wind protons. As they propagate upstream, the ion bulk velocity decreases and the magnetic field increases in the foot, which results in a flattening of the magnetic field profile and in a decrease of the normal electric field. Subsequently the reflection rate decreases and the whole shock profile steepens again. Superimposed on this ' breathing' behavior are in the realistic mass ratio case the waves due to the MTSI. The simulations lead us to a re-interpretation of the 24 January 2001 bow shock observations reported by Lobzin et al. (2007). It is suggested that the high frequency waves observed in the magnetic field data are due to the MTSI and are not related to a nonlinear phase standing whistler. Different profiles at the different spacecraft are due to the non-stationary behavior on the larger time scale.. |
| 80. | Umeda, T., Y. Kidani, M. Yamao, S. Matsukiyo, R. Yamazaki, On the reformation at quasi- and exactly perpendicular shocks: Full particle-in-cell simulations, Journal of Geophysical Research, 10.1029/2010JA015458, 115, A10250, vol.115, A10250, 2010.10, [URL]. |
| 81. | Shuichi Matsukiyo, Mach number dependence of electron heating in high Mach number quasiperpendicular shocks, Physics of Plasmas, 10.1063/1.3372137, 17, 4, 042901, Vol.17, Issue 4, pp.042901, 2010.04, [URL]. |
| 82. | Shuichi Matsukiyo, Tohru Hada, Relativisitic particle acceleration in developing Alfven turbulence, Astrophysical Journal, 10.1088/0004-637X/692/2/1004, 692, Issue 2, 1004-1012, vol.692, pp.1004-1012, 2009.02, [URL]. |
| 83. | Nariyuki, Y.; Matsukiyo, S.; Hada, T., Parametric instabilities of large-amplitude parallel propagating Alfvén waves: 2D PIC simulation, New Journal of Physics, 10.1088/1367-2630/10/8/083004, 10, Issue 8, 083004, Volume 10, Issue 8, pp. 083004 DOI:10.1088/1367-2630/10/8/083004, 2008.08, [URL]. |
| 84. | Terasawa, T.; Hada, T.; Matsukiyo, S.; Oka, M.; Bamba, A.; Yamazaki, R., Shock Modification by Cosmic-Ray-Excited Turbulences, Progress of Theoretical Physics Supplement, 169, 146-149, No. 169, pp. 146-149, 2007.06, [URL]. |
| 85. | Terasawa Toshio, Hada Tohru, Matsukiyo Shuichi, OKA Mitsuo, BAMBA Aya, YAMAZAKI Ryo, Shock Modification by Cosmic-Ray-Excited Turbulences(Chapter 6. SN1006 Milenium Special Session, The Extreme Universe in the Suzaku Era) :, Progress of theoretical physics. Supplement, 10.1143/ptps.169.146, 169, 169, 146-149, 2007.04, In cosmic-ray-mediated shocks large amplitude Alfven waves are believed to be generated by accelerated cosmic ray particles. The enhanced magnetic pressure shared by these waves is non-negligible in the momentum and energy balances across the shock transition region. Accordingly the shock Rankine-Hugoniot condition is further modified, and the compression ratio across the shock departs from the classical values of 4 (nonrelativistic) and 7 (relativistic). We argue that in the 'grand equipartition' limit, namely equipartition among the waves, the background plasma, and the cosmic ray particles, the compression ratio recovers to the value of 4, and the corresponding spectral index of cosmic ray particles also comes back to the canonical value of 2.. |
| 86. | Shuichi Matsukiyo, Manfred Scholer, Shock angle dependence of nonstationary behaviour of quasi-perpendicular shocks, IRCS International workshop on Shock Formation under Extreme Environments in the Universe, 2007.03. |
| 87. | Shuichi Matsukiyo, Manfred Scholer, David Burgess, Pickup protons at quasi-perpendicular shocks: full particle electrodynamic simulations, Annales Geophysicae, 25, Issue 1, 283-291, vol.25, Issue 1, pp.283-291, 2007.01, [URL]. |
| 88. | Munoz,V.; Hada,T.; Matsukiyo,S., Kinetic effects on the parametric decays of Alfvén waves in relativistic pair plasmas, Earth, Planets and Space, 58, 1213-1217, Vol.58, pp.1213-1217, 2006.09, [URL]. |
| 89. | Shuichi Matsukiyo, Manfred Scholer, On reformation of quasi-perpendicular collisionless shocks, Advances in Space Research, 10.1016/j.asr.2004.08.012, 38, Issue 1, 57-63, vol. 38, Issue 1, pp.57-63, 2006.09, [URL].  |
| 90. | Shuichi Matsukiyo, Manfred Scholer, On reformation of quasi-perpendicular collisionless shocks, DYNAMICAL PROCESSES IN CRITICAL REGIONS OF THE HELIOSPHERE, 10.1016/j.asr.2004.08.012, 38, 1, 57-63, 2006.07, We review recent studies on mass ratio dependence of self-reformation of high Mach number, low beta, highly oblique quasi-perpendicular shocks by Scholer et al. (Scholer, M., Shinohara, L, Matsukiyo, S. Quasi-perpendicular shocks: length scale of the cross-shock potential, shock reformation, and implication for shock surfing, J. Geophys. Res., 108, 1014, doi:10.1029/2002JA009515, 2003), Matsukiyo and Scholer (Matsukiyo, S., Scholer, M. Modified two-stream instability in the foot of high Mach number quasi-perpendicular shocks, J. Geophys. Res., 108, 1459, doi:10.1029/2003JA10080, 2003), and Scholer and Matsukiyo (Scholer, M., Matsukiyo, S. Nonstationarity of quasi-perpendicular shocks: a comparison of full particle simulations with different ion to electron mass ratio, Ann. Geophys., in press, 2004). A one-dimensional full particle simulation code is utilized. In small ion to electron mass ratio runs, reformation is due to the accumulation of gyrating reflected ions at the upstream edge of the foot. Furthermore, at an extremely small mass ratio, the Buneman instability is generated in the foot. In the realistic mass ratio run, however, the modified two-stream instability excited in the foot plays an important role in a shock reformation process. (c) 2006 COSPAR. Published by Elsevier Ltd. All rights reserved.. |
| 91. | Shuichi Matsukiyo, Manfred Scholer, On microinstabilities in the foot of high Mach number perpendicular shocks, Journal of Geophysical Research, 10.1029/2005JA011409, 111, Issue A6, CiteID A06104, vol. 111, Issue A6, CiteID A06104, DOI 10.1029/2005JA011409, 2006.06, [URL]. |
| 92. | S. Matsukiyo, M. Scholer, On microinstabilities in the foot of high Mach number perpendicular shocks, Journal of Geophysical Research: Space Physics, 10.1029/2005JA011409, 111, 6, A06104-A06104, 2006.06, Microinstabilities excited in the foot of a supercritical perpendicular shock wave are investigated. A two-dimensional full particle simulation with periodic boundary conditions in both directions using the physical ion to electron mass ratio is performed as a proxy for the foot region where incoming and specularly reflected ions overlap. The simulation shows that six types of different instabilities are excited in a time period shorter than ion gyroperiod of the reflected ions. The most dominant instability is the modified two-stream instability, which leads to strong parallel electron heating through a so-called two step instability and to ion phase space holes. Copyright 2006 by the American Geophysical Union.. |
| 93. | Manfred Scholer, Shuichi Matsukiyo, On Kinetic Structure of Quasi-Perpendicular Collisionless Shocks, THE PHYSICS OF COLLISIONLESS SHOCKS: 4th Annual IGPP International Astrophysics Conference. AIP Conference Proceedings, 10.1063/1.2032669, 781, 22-26, Volume 781, pp. 22-26, 2005.08. |
| 94. | M Scholer, S Matsukiyo, On kinetic structure of quasi-perpendicular collisionless shocks, PHYSICS OF COLLISIONLESS SHOCKS, 781, 22-26, 2005.08, We discuss one-dimensional electromagnetic full particle simulations of quasi-perpendicular collisionless shocks with physical mass ratio in the context of recent Cluster bow shock measurements. The density ramp scale in units of the ion inertial length obtained from simulations of high ion beta shocks (beta(i) approximate to 1) does not increase with Mach number, contrary to what has been reported from Earth's bow shock measurements. Several possibilities are offered which could explain this discrepancy. In low beta shocks the modified two-stream instability is important in the foot of the shock and can lead to large density and electric field spikes. It is suggested that recent Cluster observations of short scale electric field spikes at the quasi-perpendicular Earth's bow shock can be explained in terms of the modified two-stream instability.. |
| 95. | Shuichi Matsukiyo, Manfred Scholer, Modified two-stream instability in a high Mach number quasi-perpendicular shock front, Proceedings of the 7th ISSS (International School/Symposium for Space Simulations), pp. 313-314, 2005.03. |
| 96. | Shuichi Matsukiyo, Manfred Scholer, Structure of high Mach number quasi-perpendicular shocks and wave-particle interactions in their transition region, プラズマ科学シンポジウム2005 / 第22回プラズマプロセシング研究会（PSS-2005/SPP-22）プロシーディングス, 2005.01. |
| 97. | Tohru Hada, Shuichi Matsukiyo, Masahiro Ikeda, Victor Munoz, Dispersion relation and nonlinear evolution of large amplitude relativistic Alfven waves, プラズマ科学シンポジウム2005 / 第22回プラズマプロセシング研究会（PSS-2005/SPP-22）プロシーディングス, 2005.01. |
| 98. | Tohru Hada, Shuichi Matsukiyo, Victor Munoz, Disperson relation of finite amplitude Alfven wave in a relativistic electron- positron plasma, 12th International Congress on Plasma Physics, eprint arXiv:physics/0410203, 2004.10. |
| 99. | Manfred Scholer, Shuichi Matsukiyo, Nonstationarity of quasi-perpendicular shocks: a comparison of full particle simulations with different ion to electron mass ratio, Annales Geophysicae, 22, Issue 7, 2345-2353, Vol.22, pp.2345-2353, 2004.07, [URL]. |
| 100. | Shuichi Matsukiyo, Rudolf Treumann, Manfred Scholer, Coherent waveforms in the auroral upward current region, Journal of Geophysical Research, 10.1029/2004JA010477, 109, Issue A6, CiteID A06212, Volume 109, Issue A6, CiteID A06212, 2004.06, [URL]. |
| 101. | Shuichi Matsukiyo, Manfred Scholer, Modified two-stream instability in the foot of high Mach number quasi-perpendicular shocks, Journal of Geophysical Research, 10.1029/2003JA010080, 108, Issue A12, SMP 19-1, Volume 108, Issue A12, pp. SMP 19-1, CiteID 1459, DOI 10.1029/2003JA010080, 2003.12, [URL]. |
| 102. | Shuichi Matsukiyo, Tohru Hada, Parametric instabilities of circularly polarized Alfvén waves in a relativistic electron-positron plasma, Physical Review E,, 10.1103/PhysRevE.67.046406, 67, Issue 4, id. 046406, vol. 67, Issue 4, id. 046406, 2003.04, [URL]. |
| 103. | S. Matsukiyo, T. Hada, Parametric instabilities of circularly polarized Alfvén waves in a relativistic electron-positron plasma, Physical Review E, 10.1103/PhysRevE.67.046406, 67, 4, 12, 2003.04. |
| 104. | Manfred Scholer, Iku Shinohara, Shuichi Matsukiyo, Quasi-perpendicular shocks: Length scale of the cross-shock potential, shock reformation, and implication for shock surfing, Journal of Geophysical Research, 10.1029/2002JA009515, 108, Issue A1, SSH 4-1, Volume 108, Issue A1, pp. SSH 4-1, CiteID 1014, DOI 10.1029/2002JA009515, 2003.01, [URL]. |
| 105. | Shuichi Matsukiyo, Tohru Hada, Nonlinear evolution of electromagnetic waves driven by the relativistic ring distribution, Physics of Plasmas, 10.1063/1.1431593, 9, Issue 2, 649-661, Volume 9, Issue 2, February 2002, pp.649-661, 2002.02, [URL]. |
| 106. | , [URL]. |
| 107. | Shuichi Matsukiyo, Tohru Hada, Long time evolution of electromagnetic waves driven by the relativistic ring distribution, Engineering Sci. Rep., vol.22, No.4, pp. 375 – 384, 2001.01, [URL]. |
| 108. | Shuichi Matsukiyo, Tohru Hada, Mitsuhiro Nambu, Jun-Ichi Sakai, Comparison between the Landau and Cyclotron Resonances in the Electron Beam-Plasma Interactions, Journal of Physical Society of Japan, 10.1143/JPSJ.68.1049, 68, Issue 3, 1049-1054, Vol.68, Issue 3, pp.1049-1054, 1999.03, [URL]. |
| 109. | Shuichi Matsukiyo, Mitsuhiro Nambu, Tohru Hada, Jun-ichi Sakai, Torsten Neubert, Simulation study on generation of waves from electron beam by the Cherenkov maser, Proceedings of The Fifth International School/Symposium for Space Simulations, 1997.03. |
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