1. |
Higuchi, H, and A. Yoshikawa, Electron acceleration mechanism in "ionospheric polarized Poleward Boundary Intensification": A new validation with 3-dimensional fluid electron acceleration simulators, American Geophysics Union Fall Meeting 2021, 2021.12. |
2. |
M. Hayashi, A.Yoshikawa, A.Fujimoto, S.Ohtani, Research on the Poler to Mid-latitude Ionospheric Response During Substorm based on mid-latitude electric field and global magnetic field observations, American Geophysics Union Fall Meeting 2021, 2021.12. |
3. |
Takayama Kumi, Yoshikawa Akimasa , Principal Component Analysis for Extracting Variations due to Sq Current and Atmospheric Tides from Magnetic Field Data, American Geophysics Union Fall Meeting 2021, 2021.12. |
4. |
Yasunaga Akihiro、Akimasa Yoshikawa, and Fujimoto Akiko, Research on the unique Solar Flare Effect (SFE*) at the dip equator around local noon, AOGS Annual Virtual Meeting 2021, 2021.08. |
5. |
Takayama Kumi, Yoshikawa Akimasa, and Miyoshi Yasunobu, Quasi-6-Day Wave Effect on Electric Conductivity, Electric field, and Current with GAIA model, AOGS Annual Virtual Meeting 2021, 2021.08. |
6. |
#M.Hayashi, @A.Yoshikawa, A.Fujimoto, S.Ohtani,, Research for formation of global current system during substorm through observation of ionospheric response at mid-latitudinal region, AOGS Annual Virtual Meeting 2021, 2021.08. |
7. |
山本 衛、橋口 浩之、横山 竜宏、宮岡 宏、小川 泰信、塩川 和夫、野澤 悟徳、@吉川 顕正、津田 敏隆, Study of coupling processes in the solar-terrestrial system, Japan GeoScience Meeting 2021, 2021.06. |
8. |
惣宇利 卓弥、新堀 淳樹、大塚 雄一、津川 卓也、西岡 未知、@吉川 顕正, Generation mechanisms of plasma density irregularity from equatorial to midlatitude ionosphere during a geomagnetic storm on 21 and 22 December 2014, Japan GeoScience Meeting 2021, 2021.06. |
9. |
大矢 浩代、折戸 雄飛、土屋 史紀、山本 真行、中田 裕之、@吉川 顕正, D-region ionospheric effects for 2016 eruptions of Mt. Aso using LF transmitter signals, Japan GeoScience Meeting 2021, 2021.06. |
10. |
藤本 晶子、@阿部 修司、御厨 徹、池田 昭大、@吉川 顕正, Multiple equatorial ionospheric observation project based on FMCW radar combining MAGDAS/SDR-based scintillation detector, Japan GeoScience Meeting 2021, 2021.06. |
11. |
@吉川 顕正、#橋本 翼、中溝 葵、大谷 晋一, Development of a novel method for extracting the geometrical properties of the magnetic vector fields towards the era of multi-point satellite observations, Japan GeoScience Meeting 2021, 2021.06. |
12. |
塩川 和夫, 三好 由純, @吉川 顕正、中村 卓司, 太陽地球系物理学科学委員会(SCOSTEP)の活動と展望:学術会議を通した国際活動の推進, Japan GeoScience Meeting 2021, 2021.06. |
13. |
ラナシンハ マンジュラ, 藤本 晶子, @吉川 顕正, ジャヤラトナ チャンダ, Seasonal dependence of dusk-side equatorial IHFACs polarity during solar cycle 23-24, Japan GeoScience Meeting 2021, 2021.06. |
14. |
中溝 葵, @吉川 顕正, 中田 裕之, 深沢 圭一郎, 田中 高史, Development of a new M-I coupling algorithm in global MHD magnetosphere simulation: Alfvénic-Coupling, Japan GeoScience Meeting 2021, 2021.06. |
15. |
@Akimasa Yoshikawa, Modeling of magnetosphere-ionosphere-atmosphere system for investigation of coupling process in the space-terrestrial transition region, Japan GeoScience Meeting 2021, 2021.06. |
16. |
@Kirolosse Mina Girgis, @Tohru Hada, @Shuichi Matsukiyo, @Akimasa Yoshikawa, , Numerical Proton Flux Response in South Atlantic Anomaly during Geomagnetic Storm, Japan GeoScience Meeting 2021, 2021.06. |
17. |
#森澤将、@吉川顕正、大谷晋一, 夜側オーロラオーバルの極側境界で起こるオーロラ増光現象の発生過程における電離圏分極の数値解析, Japan GeoScience Meeting 2021, 2021.06. |
18. |
#伊集院拓也、@吉川顕正, IGRFモデルを用いた3次元全球電離圏静電ポテンシャルソルバーの開発, Japan GeoScience Meeting 2021, 2021.06. |
19. |
#Yasunaga Akihiro、Fujimoto Akiko、@Yoshikawa Akimasa, Study on the Solar Flare Effect (SFE*) of equatorial electrojet around local noon, Japan GeoScience Meeting 2021, 2021.06. |
20. |
#Takayama Kumi, @Yoshikawa Akimasa, and @Miyoshi Yasunobu, Seasonal Dependence of the Quasi-6-Day Oscillation in Sq-EEJ Current System, Japan GeoScience Meeting 2021, 2021.06. |
21. |
#Higuchi, H. and @A. Yoshikawa, , Exploring the Electron Acceleration Mechanism in the Poleward Boundary Intensification, Japan GeoScience Meeting 2021, 2021.06. |
22. |
M.Hayashi, A.Yoshikawa, A.Fujimoto , S. Ohtani, Investigation of the mid-latitude ionospheric response during substorm based on magnetic and electric field observations, Japan GeoScience Meeting 2021, 2021.06. |
23. |
中溝 葵, 吉川 顕正, 大谷 晋一, 田中 高史, Alfvénic disturbances generated by the ionospheric polarization and the convection reversal in the magnetosphere, JpGU-AGU Joint Meeting 2020, 2020.07. |
24. |
吉川 顕正, 中溝 葵, 大谷 晋一, Causality for formation of electromagnetic channel from Polar to Equatorial Ionosphere, JpGU-AGU Joint Meeting 2020, 2020.07. |
25. |
吉川 顕正, 河野 英昭, 阿部 修司, 魚住 禎司, 藤本 晶子, 池田 昭大, 樺澤 大生, 黒木 智, 林 萌英, 高山 久美, 中溝 葵, Ohtani Shinichi, Investigation of global electromagnetic coupling from polar to equatorial ionosphere, JpGU-AGU Joint Meeting 2020, 2020.07. |
26. |
樺澤 大生, 吉川 顕正, 魚住 禎司, 藤本 晶子, 阿部 修司, MAGDAS9システムの10Hzデータによる、Pc2脈動の全球的発生分布特性解明, JpGU-AGU Joint Meeting 2020, 2020.07. |
27. |
高山 久美, 三好 勉信, 吉川 顕正, Sq・EEJ電流系における6日振動現象に着目した大気圏ー電離圏の上下結合の研究, JpGU-AGU Joint Meeting 2020, 2020.07. |
28. |
林 萌英, 吉川 顕正, 藤本 晶子, 大谷 晋一, 磁気圏電離圏全球結合系解明に向けたイオノグラムの自動読み取り, JpGU-AGU Joint Meeting 2020, 2020.07. |
29. |
Yoshimasa Tanaka, Yasunobu Ogawa, Akira Kadokura, Takanori Nishiyama, Akimasa Yoshikawa, Bjorn Gustavsson, Kirsti Kauristie, Carl-fredrik, Enell, Urban Brandstrom, Tima Sergienko, Alexander Kozlovsky, Tero Raita, Vanhamaki Heikki, Study on auroral 3D structure in the northen Europe, Sixth International Symposium on Arctic Research (ISAR-6), Online, 2020.03. |
30. |
Ikeda A., T. Uozumi, A. Yoshikawa, A. Fujimoto, and S. Abe, Diurnal and seasonal variations in the Schumann Resonance observed at Kuju Japan, AGU fall meeting, 2019.12. |
31. |
Aoi Nakamizo and Akimasa Yoshikawa, Deformation of ionospheric potential pattern by ionospheric Hall polarization, SuperDARN Workshop 2019, Fuji, 2019.06, The present study shows that the ionospheric Hall polarization can deform the high-latitude ionospheric convection field, which is widely considered to be a manifestation of the convection field in the magnetosphere. We perform the Hall polarization field separation with a potential solver by changing the conductance distribution step- by-step from a uniform one to a more realistic one. We adopt dawn-dusk and north-south symmetric distributions of conductance and region 1 (R1) field-aligned current (FAC). The pair of the primary field of the R1 system and each gradient of Hall conductance generates the Hall polarization field and consequently causes potential deformations as follows. (a) The equatorward gradient causes clockwise rotation. (b) The gradient across the terminator, together with the effect of the equatorward gradient, causes the dawn-dusk asymmetry. (c) The high conductance band in the auroral region causes kink-type deformations. In particular, a nested structure at the equatorward edge of the band in the midnight sector well resembles the Harang Reversal. Result (a) can explain the clockwise bias inexplicable by the IMF-By effect alone, the combination of (a) and (b) can explain the clearness and unclearness in the round or crescent shapes of the dawn-dusk cells depending on the IMF-By polarity, and (c) suggests that the ionosphere may not need the upward-FAC for the formation of the Harang Reversal. We suggest that the final structure of the ionospheric potential is established by the combined effects of both the magnetospheric requirements (external causes) and ionospheric polarization (internal effect).. |
32. |
Akimasa Yoshikawa, MAGDAS project: Research for global and local electromagnetic coupling from polar to equatorial ionosphere, SuperDARN Workshop 2019, Fuji, 2019.06, International Center for Space Weather Science and Education (ICSWSE) of Kyushu University is a research institute that conducts academic research and education in space weather and related fields. We have constructed an observation network known as the "MAGDAS/CPMN (MAGnetic Data AcquisitionSystem/Circum-pan Pacific Magnetometer Network)" in international collaboration with more than 60 organizations, including those in developing countries. Currently, over 80 magnetometers and 4 FM-CW (Frequency Modulated Continuous Wave) radars have been installed all over the world. To understand the active role of ionospheric dynamics on the global and local Magnetosphere-Ionosphere coupling from polar to equatorial ionosphere, we conduct integrated studies of theory, numerical simulation, in-situ magnetosphere observation, and global ionosphere observation by MAGDAS. Especially, the ionospheric Hall effect strongly controls the spatiotemporal evolution of the M-I coupling system. Generation of polarization electric field at conductance gradient regions causes rotation, shear, and acceleration/deceleration of ionospheric convection in both local and global manners. The ionospheric polarization field activates upward shear Alfven wave that could cause ionospheric driven magnetospheric dynamics and induce a new type of M-I coupled current system. Generation of induction electric field at the wavefront of ionospheric disturbances enables the electric field of electrostatic potential type to propagate horizontally as a result of coupling between magnetosonic mode and shear Alfven mode induced by multistep Hall effect in a time domain, at the ionospheric E-layer. Such a combined effect of ionospheric Hall polarization and induction on the ionospheric dynamics is a key element for understanding the formation process of the global current system from polar to equatorial ionosphere. In this talk, we will discuss how to identify elementary components of Hall-polarization and induction effect (generalized Cowling effect) from coupled phenomena, and the possibility of collaborative studies between SuperDARN and MAGDAS project to further understand active role of ionospheric dynamics.. |
33. |
Akimasa Yoshikawa, Revisiting the energy conversion process of Birkeland current, 日本地球惑星科学連合2019年大会, 2019.05. |
34. |
藤本 晶子, 池田 昭大, 吉川顕正, Latest installation of FM-CW radar in Peru, 日本地球惑星科学連合2019年大会, 2019.05. |
35. |
樺澤 大生, 吉川 顕正, 魚住 禎司, 藤本 晶子, 阿部 修司, MAGDAS9システムの10Hzデータによる,Pc1-2脈動の全球分布特性解明, 日本地球惑星科学連合2019年大会, 2019.05. |
36. |
吉川 顕正, 樺澤 大生, 魚住 禎司, 藤本 晶子, 阿部 修司, Development of MAGDAS project: Search for global electromagnetic coupling from polar to equatorial ionosphere, 日本地球惑星科学連合2019年大会, 2019.05. |
37. |
山本 衛, 橋口 浩之, 横山 竜宏, 宮岡 宏, 小川 泰信, 塩川 和夫, 野澤 悟徳, 吉川 顕正, 津田 敏隆, 太陽地球系結合過程の研究基盤形成, 日本地球惑星科学連合2019年大会, 2019.05. |
38. |
Mio Nakahara, Akimasa Yoshikawa, Teiji Uozumi, Akiko Fujimoto, Electromagnetic induction responses to geomagnetic disturbances at low-and-mid-latitudes, 1st International Conference on Space Weather and Satellite Application 2018, ICeSSAT 2018, 2019.03, The geomagnetically induced current (GIC) is one of the most widely recognized phenomena caused by geomagnetic disturbances. Realistic predictions of magnetic field fluctuations may be used to evaluate the induction of electric fields to ground surfaces, and thus to estimate the occurrence of GICs. Although many GICs occur at high latitudes, they are now being studied at low and mid-latitudes as well. The purpose of this research was to understand the dynamics, observation, and prediction in Japan for GICs occurring at the low and mid-latitudes. In this study, the influence of geomagnetic field variations on Earth's electric field was examined. The magnetic field and the electric field components of 3 observation points for 1 year in 2015 are visually examined, and the characteristics of the fluctuations of the magnetic field and the surface electrical field were also analysed.. |
39. |
T. Akiyama, Akimasa Yoshikawa, A. Fujimoto, T. Uozumi, Relationship between plasma bubble and ionospheric current, equatorial electrojet, and equatorial counter electrojet, 1st International Conference on Space Weather and Satellite Application 2018, ICeSSAT 2018, 2019.03, In recent years, it has been clarified from previous studies that plasma bubbles and equatorial electrojets (EEJs) are related. In general, EEJs are calculated by subtracting the magnetic field H component of the magnetic equator from that at low latitude. However, in this study, EE-index data at Langkawi (magnetic equator), which includes all local current systems, were used for the analysis during the period from January 1, 2011, to November 8, 2014. By using the EE-index, it was found that plasma bubbles tend to occur for larger EEJ strengths. This result differs from the previous studies. In addition, if an equatorial counter electrojet (CEJ) occurs, it is understood that plasma bubbles will rarely occur due to the westward current; however, we found that when the lunar tidal effect is strong, plasma bubbles can occur even in conjunction with CEJs. Finally, we want to find the relationship between plasma bubbles and ionospheric current to predict them.. |
40. |
Akimasa YOSHIKAWA, Research of Geomagnetism for Earth and Space Environmen, Theme Seminar of the Scientific lecture at the annual Theme Seminar of the Sri Lanka Association for the Advancement of Science (“Space Science and Technology Applications for Sustainable Development” ), 2018.12. |
41. |
Akimasa YOSHIKAWA, Geomagnetism and Life, Geomagnetic Focus Group Discussion 2018, 2018.09. |
42. |
Akimasa YOSHIKAWA, Space Weather Data in IR 4.0 (Industry Revolution 4.0) era and the success story on MAGDAS project, International Conference on Space Weather and Satellite Application (ICeSSAT2018), 2018.08. |
43. |
Takafumi Akiyama and Akimasa Yoshikawa, Akiko Fujimoto, Teiji Uozumi, Relationship Between Plasma Bubble and Ionospheric Current Equatorial Electrojet and Equatorial Counter Electrojet, International Conference on Space Weather and Satellite Application (ICeSSAT2018), 2018.08. |
44. |
Siti Nurbaiti Ibrahim, Mohamad Huzaimy Jusoh, Ahmad Asari Sulaiman, Akimasa Yoshikawa, Characteristic of the Disturbed Days Ionospheric Current System in the 180-Degree Magnetic Meridian, International Conference on Space Weather and Satellite Application (ICeSSAT2018), 2018.08. |
45. |
Akimasa Yoshikawa, On Generalization of Birkeland Current System in the Tree-Dimensional Magnetosphere-Ionosphere Coupling, AOGS2018 15th Annual Meeting, 2018.06. |
46. |
Teiji UOZUMI, Akimasa YOSHIKAWA, Shin OHTANI, Dmitry BAISHEV, Alexey MOISEEV, Boris SHEVTSOV, Decomposition of the Wave Elements of the Global High-Correlation Pi 2, AOGS2018 15th Annual Meeting, 2018.06. |
47. |
Akiko FUJIMOTO, Akimasa YOSHIKAWA, Toshiya NISHIGUCHI, Local Time Characteristic of Low-Latitude Geomagnetic Field Response to Intense Solar Flares, AOGS2018 15th Annual Meeting, 2018.06. |
48. |
Akihiro IKEDA, Teiji UOZUMI, Akimasa YOSHIKAWA, Akiko FUJIMOTO, Shuji ABE, Hiromasa NOZAWA, Manabu SHINOHARA, Response of Schumann Resonance to Solar and Geomagnetic Activities, AOGS2018 15th Annual Meeting, 2018.06. |
49. |
A Nakamizo, A Yoshikawa, T Tanaka, Effects of Ionospheric Hall Polarization on Magnetospheric Configurations and Dynamics in Global MHD Simulation, AGU Fall Meeting, 2017.12. |
50. |
Yoshikawa A., Monitoring of Space and Earth electromagnetic environment by MAGDAS project: Collaboration with IKIR, International Conference on Solar-Terrestrial Relations and Physics of Earthquake Precursors, 2017.09. |
51. |
Akihiro Ikeda, Teiji Uozumi, Akimasa Yoshikawa, Akiko Fujimoto, Shuji Abe, Hiromasa Nozawa, Manabu Shinohara, Characteristics of Schumann Resonance Parameters at Kuju Station, International Conference on Solar-Terrestrial Relations and Physics of Earthquake Precursors, 2017.09. |
52. |
Yoshikawa A., Study of Coupling Processes in the Solar-Terrestrial System, 2nd National School on EARTH and ELECTROMAGNETISM, 2017.08. |
53. |
Yoshikawa A., Geomagnetic observation to support space weather study, AMGASA Public Talk, 2017.08, 汎世界的な地磁気多点観測網によりあぶり出される様々な宇宙天気現象、宇宙ー気象ー地象結合現象について紹介し、その適用サイエンスの幅広さと様々な地球物理現象のモニタリングの可能性について、わかりやすく講演する。. |
54. |
Yoshikawa A., What is Space Weather?, Universidad Nacional Agraria de la Selva (UNAS) Invited Seminar, 2017.08. |
55. |
Yoshikawa A., Recent Development of ICWSE/MAGDAS project for Study of Coupling Processes in the Solar-Terrestrial System, 日本地球惑星科学連合2017大会, 2017.05. |
56. |
Yoshikawa A., Magnetosphere-Ionosphere coupling process produced by Ampere force forcing from the magnetosphere, 日本地球惑星科学連合2017大会, 2017.05. |
57. |
藤本 晶子, 吉川 顕正, 魚住 禎司, 阿部 修司, 松下 拓輝, MAGDASプロジェクトEE-indexの磁気赤道域現象への適用事例, 日本地球惑星科学連合2017大会, 2017.05. |
58. |
中溝 葵, 吉川 顕正, 田中 高史, Study on Effects of Ionospheric Polarization Field and Inner Boundary Conditions on Magnetospheric Dynamics and Substorm Processes in Global MHD Simulation, 日本地球惑星科学連合2017大会, 2017.05. |
59. |
今城 峻, 吉川 顕正, 魚住 禎司, 大谷 晋一, 中溝 葵, Application of Global Three-Dimensional Current Model for Dayside and Terminator Pi2 Pulsations, 日本地球惑星科学連合2017大会, 2017.05. |
60. |
秋山 鷹史, 吉川 顕正, 松下 拓輝, 藤本 晶子, 魚住 禎司, On the relationships between EEJ distribution and plasma bubble occurrences, 日本地球惑星科学連合2017大会, 2017.05. |
61. |
中原 美音, 松下 拓輝, 吉川 顕正, 魚住 禎司, 藤本 晶子, 阿部 修司, 磁気擾乱時における中低緯度領域電磁誘導応答の研究, 日本地球惑星科学連合2017大会, 2017.05. |
62. |
阿部 修司, 花田 俊也, 吉川 顕正, 平井 隆之, 河本 聡美, スペースデブリ環境推移モデルにおける大気密度モデルの改良と宇宙天気活動の影響評価, 日本地球惑星科学連合2017大会, 2017.05. |
63. |
津田 敏隆, 山本 衛, 橋口 浩之, 宮岡 宏, 小川 泰信, 塩川 和夫, 野澤 悟徳, 吉川 顕正, Study of the Coupled Solar-Earth System with Large Atmospheric Radars, Ground-based Observation Network and Satellite Data: Project Overview, 日本地球惑星科学連合2017大会, 2017.05. |
64. |
Nurul Shazana Abdul Hamid, Saeed Abioye Bello, Mardina Abdullah, Akimasa Yoshikawa, The Sq-current and the Ionospheric Profile Parameters during Solar Minimum, 日本地球惑星科学連合2017大会, 2017.05. |
65. |
Nurul Shazana Abdul Hamid, Wan Nur Izzaty Ismail, Mardina Abdullah, Akimasa Yoshikawa, Latitudinal and Longitudinal Profile of EEJ current during different phases of Solar Cycle, 日本地球惑星科学連合2017大会, 2017.05. |
66. |
Quirino Sugon Jr., Christine Chan, Felix Muga II, Clint Bennett, Randell Teodoro, Sergio Su, Daniel McNamara, Dexter Lo, Roland Otadoy, Grace Rolusta, Akiko Fujimoto, Teiji Uozumi, and Akimasa Yoshikawa, Co-seismic magnetic signatures of Moro Gulf Quake of 2010-07-23 using MAGDAS data, 地域ネットワークによる宇宙天気の観測・教育活動に関する研究集会, 2017.03. |
67. |
Yoshikawa A., A. Nakamizo, and S. Ohtani, Generalized Description of Three- Dimensional Magnetosphere-Ionosphere Coupling by Shear Alfvén Waves, 2016 Fall AGU Meeting, 2016.12. |
68. |
Ohtani, S., and A. Yoshikawa, Field-aligned Currents Induced by Electrostatic Polarization at the Ionosphere: Application to the Poleward Boundary Intensification (PBI) of Auroral Emission, 2016 Fall AGU Meeting, 2016.12. |
69. |
A. Nakamizo and A. Yoshikawa, Possibility of Ionospheric Cause of FACs and Convection Field in the Magnetosphere-Ionosphere System: The Harang Reversal, Premidnight Upward-FAC, and the Ionospheric Hall Polarization Field, 2016 Fall AGU Meeting, 2016.12. |
70. |
Matsushita, H., A. Yoshikawa, T. Uozumi, A. Fujimoto, S. Abe, J. K. Ishitsuka, O. Veliz, D. Rosales, E. Safor and V. Beteta, Development of EEJ Model Based on Dense Ground-based Magnetometer Array, 2016 Fall AGU Meeting, 2016.12. |
71. |
@Yoshikawa A., Magnetosphere-Ionosphere Coupling, The SCOSTEP/ISWI International School on Space Science, 2016.11. |
72. |
Yoshikawa A., (B,V) Paradigm of Magnetosphere-Ionosphere Coupling, URSI Asia-Pacific Radio Science Conference (URSI AP-RASC 2016), 2016.08, これまでの磁気圏電離圏結合研究では、磁気圏側はMHDダイナミクス(B-Vパラダイム)で、電離圏側は静電的な電離層電流層近似(J-Eパラダイム)で扱われ、その両者は静電的な境界条件をつうじた結合問題として扱われてきた。本研究では電離圏ダイナミクスをイオン-中性大気の衝突効果により必然的に生じるHall電場を電離圏から磁気圏までシームレスに導入する理論的枠組を整理し、磁気圏電離圏結合系を一つの系のダイナミクスの下に記述する(B,V)パラダイムを提案する。これにより、これまで電気回路的な理解しかされてこなかった電離圏特有の現象をプラズマダイナミクスの文脈の下に記述することが可能となる。. |
73. |
Impact of Space Weather on Earth COSPAR Capacity Building Workshop, Magnetosphere-Ionosphere coupling by shear Alfven wave, August 15 – 26, 2016, 2016.08. |
74. |
Yoshikawa A., Fujimoto, A., T. Uozumi, S. Abe, H. Matsushita, and, S. Abe, Space Weather Indexes Produced by ICSWSE/MAGDAS Project, Asia Oceania Geoscience Society 13th Annual Meeting, 2016.07. |
75. |
Matsushita, H., A. Yoshikawa, T. Uozumi, A. Fujimoto, S. Abe, J. K. Ishitsuka, O. Veliz, D. ROSALES, E. SAFOR, V. BETETA, and G. CÁRDENAS, Development Of New Eej Index By Dense Magnetometer Array In Peru, presented at Asia Oceania Geoscience Society 13th Annual Meeting, Asia Oceania Geoscience Society 13th Annual Meeting, 2016.07. |
76. |
Fujimoto, A., T. Uozumi, S. Abe, H. Matsushita, and A. Yoshikawa, Long-term EE-index Variation for Monitoring Equatorial Electrojet Based on ICSWSE Magnetometer Network, Asia Oceania Geoscience Society 13th Annual Meeting, 2016.07. |
77. |
Abe. S, H. Matsushita, Y. Nawata, A. Yoshikawa, Three components analysis of ground magnetometer network data for developing GIC index,13th Annual Meeting Asia Oceania Geoscience Society, Asia Oceania Geoscience Society 13th Annual Meeting, 2016.07. |
78. |
Yoshikawa A., How much curl-free Hall current flows out to the magnetosphere as field-aligned current from Cowling channel?, Chamman Conference on Current in Geospace and Beyond, 2016.05. |
79. |
Yoshikawa A., Shuji Abe, Teiji Uozumi, Akiko Fujimoto, Hiroki Matsushita, Hideaki Kawano, Recent development of MAGDAS project: Strategy for international alliance of geomagnetic field network observation, 日本地球惑星科学連合2016大会, 2016.05. |
80. |
Nakamizo, A. and A. Yoshikawa, The Harang Reversal Generated by Ionospheric Polarization Field by Hall Current Divergence, 日本地球惑星科学連合2016大会, 2016.05. |
81. |
Ohtani, S., and A. Yoshikawa, What if the evolution of auroral forms does not reflect magnetospheric processes?, 日本地球惑星科学連合2016大会, 2016.05. |
82. |
Abe. S, H. Matsushita, Y. Nawata, A. Yoshikawa, Three components analysis of ground magnetometer network data for understanding GIC excited by space weather disturbances, 日本地球惑星科学連合2016大会, 2016.05. |
83. |
Matsushita, H, A. Yoshikawa, T. Uozumi, J. Ishitsuka, D. Rosales, O. Veliz, V. B. Alvarado and G. M. Cárdenas, Development of dense magnetometer array in Peru for investigating detailed structure of EEJ, 1st PSTEP International Symposium, 2016.01. |
84. |
Fujimoto, A., A. Yoshikawa, T. Uozumi, S. Abe, and H. Matsushita, Space weather environment index based on ICSWSE magnetometer network, 1st PSTEP International Symposium, 2016.01. |
85. |
Yoshikawa A., Time-dependent generalized Ohm’s Law and formation of global Cowling channel in the ionosphere, 14th International Symposium on Equatorial Aeronomy (ISEA), 2015.10. |
86. |
Babatunde Rabiu, O.O.Folarin, T. Uozumi, N.S.Abdul-Hamid, A.Yoshikawa, Longitudinal variation of Equatorial Electrojet and the Occurrence of its Counter Electrojet, 14th International Symposium on Equatorial Aeronomy (ISEA), 2015.10. |
87. |
Yoshikawa A., MAGDAS Network, Space Weather, and Geomagnetic Storms, A Conference on “Scientific Frontiers: Serving the Peripheries in Times of Change”, 2015.09. |
88. |
Yoshikawa A., Description of Magnetosphere-ionosphere coupling with Alfven waves, Olaf Amm Memorial Workshop, 2015.09. |
89. |
Yoshikawa A., The Magnetosphere-Ionosphere Coupling, International School on Equatorial and Low-Latitude Ionosphere, ISELLI, 2015.09. |
90. |
Imajo S., A. Yoshikawa, T. Uozumi, S. Ohtani, A. Nakamizo, P. J. Chi, Nature of dayside ionospheric current system of Pi2 Pulsations: Comparison between equivalent currents and numerical simulation, AOGS12th Annual Meeting, 2015.08. |
91. |
Gopalswamy Nat, 吉川 顕正, 国際宇宙天気イニシアチブ プロジェクト(ISWI), 日本地球惑星科学連合2015年大会, 2015.05. |
92. |
CHI, Peter, YOSHIKAWA, Akimasa, MANN, Ian, International collaboration in ground based magnetometer observations via ULTIMA: A tribute to Professor Kiyohumi Yumoto, 日本地球惑星科学連合2015年大会, 2015.05. |
93. |
Akimasa Yoshikawa, ICSWSE/MAGDAS project, United Nations/Japan for Space Weather Symposium, 2015.03. |
94. |
Estelle, Dirand, Akimasa Yoshikawa, Computer simulation on formation of ionospheric current system accompanied by the incidence of shear Alfvén waves to the ionosphere, United Nations/Japan for Space Weather Symposium, 2015.03. |
95. |
Akimasa Yoshikawa, Hideaki Kawano, S. Abe, T. Uozumi, M. Grace, G. Maeda, ICSWSE MAGDAS project, National school on Space and Earth Electromagnetism(SEE) 2014, 2014.12. |
96. |
Kiyohumi Yumoto, Akimasa Yoshikawa, Hideaki Kawano, S. Abe, T. Uozumi, M. Grace, G. Maeda, Recent developments from ICSWSE/MAGDAS Research Project, AGU fall meeting, 2014.12. |
97. |
吉川 顕正, Technical Presentation on the International Center for Space Weather Science and Education (ICSWSE) of Kyushu University, Geomagnetic Workshop in Medan (North Sumatra, Indonesia), 2014.09. |
98. |
吉川 顕正, Magnetosphere-Ionosphere Coupling through Alfven Wave, SCOSTEP/ISWI International Space Science School (ISSS) in Peru, SCOSTEP/ISWI International Space Science School (ISSS) in Peru, 2014.09. |
99. |
Akimasa Yoshikawa, Hideaki Kawano, Shuji Abe, T. Uozumi, M. Grace, G. Maeda, Space Science Capacity Building at International Center for Space Weather Science and Education (ICSWSE), United Nations / Austria Symposium on “Space Science and the United Nations”, 2014.09. |
100. |
吉川 顕正, Theory of Cowling channel formation by reflection of shear Alfven waves from the auroral Ionosphere, AGU Chapman Conference on Low-Frequency Waves in Space Plasmas, 2014.08, Cowlingチャンネルとは電離圏に於けるHall電流が電気伝導度勾配領域において発散成分をもつことによって生じる分極電場により、2次的に励起されるHall電流によって誘導された電流系の総称であり、本来のHall電流と2次的なHall電流が同方向に流れる事により、オーロラジェット電流や、赤道ジェット電流等の強力に強調されたジェット電流効果を生み出す基本メカニズムを内包していることは良く知られている。しかしながら、このジェット電流効果を定量的にコントロールするHall電流発散の電離圏内への閉じ込め効率、Hall電流がどれくらいの割合で電離圏内に閉じ込められ、どれくらいの割合で磁気圏に沿磁力線電流として流出するのか?それによってどれくらいの強さの2次的分極電場が生成され、どの程度ジェット電流効果が生み出されるのか?という問題が理論的にも観測的にも不明なままであった。本論文では、沿磁力線電流を形成するshear Alfven waveと相互作用するHall電流系の発散部分を一意に決定する理論枠組を構築し、Hall電流の電離圏内閉じ込め効率の定式化を初めて行う事により、電離圏で最もダイナミックに変動するジェット電流系の定量的解析を可能とする道筋を示したマイルストーン的な論文である。. |
101. |
Akimasa Yoshikawa, Technical presentation on the “International Center for Space Wather Science and Education”, Kyushu University, 第52回国連宇宙平和利用委員会, 2014.02. |
102. |
Akimasa Yoshikawa, On formation of Global Cowling channel in the ionosphere and the generalized Ohm’s Law, AGU General Assembly 2013, 2013.12. |
103. |
A. Nakamizo, Akimasa Yoshikawa, Shinichi Ohtani, Akimasa Ieda, Kanako Seki, Rotation of the ionospheric electric potential caused by spatial gradients of ionospheric conductivity, AGU General Assembly 2013, 2013.12. |
104. |
G. Maeda, Akimasa Yoshikawa, S. Abe, Progress of the MAGDAS Project During 2013, AGU General Assembly 2013, 2013.12. |
105. |
Cardinal, M.G, Akimasa Yoshikawa, Hideaki Kawano, Huixin Liu, Masakazu Watanabe, S. Abe, T. Uozumi, G. Maeda, Tohru Hada, Kiyohumi Yumoto, Capacity building activities at ICSWSE, SCOSTEP, International CAWSES-II meeting, 2013.11. |
106. |
G. Maeda, Kiyohumi Yumoto, Hideaki Kawano, Akimasa Yoshikawa, Huixin Liu, Masakazu Watanabe, S. Abe, T. Uozumi, A. Ikeda, Cardinal, M.G, MAGDAS activities of year 2013, SCOSTEP, International CAWSES-II meeting, 2013.11. |
107. |
S. Abe, Akimasa Yoshikawa, Hideaki Kawano, T. Uozumi, A. Ikeda, Cardinal, M.G, G. Maeda, Kiyohumi Yumoto, Rebuild of data distribution service for MAGDAS/CPMN project
, SCOSTEP, International CAWSES-II meeting, SCOSTEP, International CAWSES-II meeting, 2013.11. |
108. |
Akimasa Yoshikawa, MAGDAS/CPMN Project, UN/Austria Symposium on “Space Weather Data, Instruments and Models: Looking Beyond the International Space Weather Initiative, 2013.09. |
109. |
Akimasa Yoshikawa, Modeling of 3-fluid dynamic and generalized Ohm’s law for understanding ionospheric dynamics, JSPS Core-to-Core Program, 2013 ISWI and MAGDAS Africa School, 2013.09. |
110. |
G. Maeda, Kiyohumi Yumoto, Hideaki Kawano, Akimasa Yoshikawa, A. Ikeda, T. Uozumi, Huixin Liu, S. Abe, Masakazu Watanabe, Cardinal, M.G, MAGDAS Activities in Australia Since 2005, AOGS Annual meeting, 2013.06. |
111. |
Magdi Elfadil Yousif Suliman, 吉川 顕正, 魚住 禎司, 湯元 清文, Remotely sensed of some parameters of the solar wind via a low-latitude Pc 5 index, 2013年度日本地球惑星科学連合大会, 2013.05. |
112. |
Akimasa Yoshikawa, State-of-art in 3D Ionosphere and internal ionospheric dynamics effect on M-I coupling, ISSI Forum "Near Earth Electro-magnetic Environment (Swarm and Cluster), 2013.04. |
113. |
Akimasa Yoshikawa, Current Closure from Polar to Equatorial Ionosphere via Cowling Channel,, EGU General Assembly 2013, 2013.04. |
114. |
Akimasa Yoshikawa, M-I couping theory, ECLAT Project Meeting, 2nd Project Review Graz, 2013.04. |
115. |
Akimasa Yoshikawa, Technical presentation on the “International Center for Space Wather Science and Education”, Kyushu University, 第50回国連宇宙平和利用委員会, 2013.02. |
116. |
Akimasa Yoshikawa, Analogy of Magnetosphere-Ionosphere coupling and Corona-chromosphere-photosphere coupling, ISSI Workshop on "Standing MHD Waves", 2013.02. |
117. |
Akimasa Yoshikawa, Formation of Cowling channel from Polar to Equatorial Ionosphere, the 2012 AGU Fall Meeting, 2012.12. |
118. |
Akimasa Yoshikawa, Establishment of International Center fot Space Science and education, United Nations/Ecuador Workshop on the International Space Weather Initiative (20th Workshop of the United Nations Basic Space Science Initiative), 2012.10. |
119. |
Akimasa Yoshikawa, Extraction of polarization field and magnetospheric impedance from the M-I coupled system via shear Alfven wave, 第132回 地球電磁気・地球惑星圏学会総会・講演会, 2012.10. |
120. |
Akimasa Yoshikawa, Aoi Nakamizo, Shin Ohtani, Teiji Uozumi, Y. Tanaka, Formation of FAC -Cowling channel connecting from polar to equatorial ionosphere, 第132回 地球電磁気・地球惑星圏学会総会・講演会, 2012.10. |
121. |
Aoi Nakamizo, Akimasa Yoshikawa, T. Hori, A. Ieda, Y. Hiraki, K. Seiki, Y. Miyoshi, T. Kikuchi, Y. Ebihara, The Response of the Dayside Equatorial Electrojet to Step-like Changes of IMF Bz, 第132回 地球電磁気・地球惑星圏学会総会・講演会, 2012.10. |
122. |
Run Shi, Huixin Liu, Akimasa Yoshikawa, 1D simulation of Electron acceleration by Inertial Alfven wave pulse, 第132回 地球電磁気・地球惑星圏学会総会・講演会, 2012.10. |
123. |
Akimasa Yoshikawa, Opening of International Space Wather Science and Education, UN/Austria Symposium on Space Weather Data Analysis, 2012.09. |
124. |
Akimasa Yoshikawa, Modeling of 3D Sq current system, JSPS Core-to-Core Program, 2012 ISWI and MAGDAS School on Space Science, 2012.09. |
125. |
吉川 顕正, Ryoichi Fujii, Olaf Amm, Heikki Vanhamakki, On the importance of the Cowling/polarization mechanism for the electrodynamics of the ionosphere and magnetosphere, 2012年度日本地球惑星科学連合大会, 2012.05. |
126. |
吉川 顕正, Shin Ohtani, 中溝葵, 魚住禎司, Kiyohumi Yumoto, 極域から磁気赤道域にかけて形成されるCowlingチャンネル, 2012年度日本地球惑星科学連合大会, 2012.05. |
127. |
吉川 顕正, 細川 敬祐, 小川 泰信, 電離圏に於ける入反射Alfven 波の分離, 2012年度日本地球惑星科学連合大会, 2012.05. |
128. |
吉川 顕正, 魚住禎司, 湯元 清文, Sq電流系に於ける3次元カウリングチャンネルモデル, 2012年度日本地球惑星科学連合大会, 2012.05. |