Kyushu University Academic Staff Educational and Research Activities Database
List of Presentations
Huixin Liu Last modified date:2023.02.26

Associate Professor / Meteorology & Solar-Terrestrial physics Laboratory / Department of Earth and Planetary Sciences / Faculty of Sciences


Presentations
1. Huixin Liu, DW1 tidal enhancements in the equatorial MLT during 2015 El Nino: the relative role of tidal heating and propagation, STP-15, 2022.02.
2. Huixin Liu, How does geomagnetic activity affect the CO2-driven trend in the thermosphere and ionosphere, IAGA-IAMAS joint meeting, 2021.08.
3. Huixin Liu, The atmosphere-ionosphere coupling and space weather, ドイツDFG基金会特別推進プログラムSPPシンポジウム, 2021.06.
4. M. Kogure Huixin Liu, Gravity wave weakening during the 2019 Antarctic stratospheric sudden warming, JpGU 2021, 2021.05.
5. Huixin Liu, Geomagnetic activity effects on CO2-driven trend in the ionosphere: GAIA experiments, European Geophysical Union 2021, 2021.04.
6. Liu Huixin, C. Tao, H. Jin, Circulation and tides in a cooler upper atmosphere: dynamical effects of CO2 doubling, COSPAR, 2021.01.
7. Huixin Liu, The Earth's upper atmosphere and space weather, JpGU2020, 2020.07, 地球の電離圏と宇宙天気の最先端の研究結果を多分野の研究者をわかりやすく解説する。.
8. Liu Huixin, AGU FAIR data policy and author guideline, SGEPSS2020 (日本電磁気・惑星学会), 2020.11.
9. Liu Huixin, C. Tao, H. Jin, Circulation and tides in a cooler upper atmosphere: dynamical effects of CO2 doubling, JpGU2020, 2020.07, Thermosphere cooling is a known effect of increasing CO2 in the atmosphere. In this study, we explore the changes of thermosphere circulation and tides in the cooled thermosphere via a doubled CO2 numerical experiment using the Ground-to-topside Atmosphere Ionosphere model for Aeronomy (GAIA). The results reveal three major features. (1) The thermosphere cools about 10 K more around solstices than equinoxes, more at the summer pole than the winter pole. (2) The meridional circulation shifts downward and strongly accelerates by 5–15 m s−1. (3) The tidal activity experiences dramatic changes, with a 40–60% reduction in the semidiurnal tides (SW2) throughout the thermosphere but an 30–50% enhancement in diurnal tides (DW1) below 200 km altitude. The nonmigrating tide DE3 has only minor changes. These changes in temperature, meridional circulation, and tides are persistent features in all seasons and can profoundly affect the spatial distribution and diurnal cycles of the ionospheric responses to CO2 doubling via atmosphere composition and electrodynamics.
10. Huixin Liu, C. Tao., H. Jin, T. Abe, Dynamical response of the upper atmosphere to CO2 doubling: GAIA simulation, AGU2019, 2019.12.
11. Huixin Liu, M. Tsutsumi, H. Liu, Vertical structure of terdiurnal tides in the Antarctic MLT region: 15-year observation over Syowa (69S, 39E), SGEPSS2019, 2019.10.
12. Huixin Liu, M. Tsutsumi, H. Liu, Vertical structure of terdiurnal tides in the Antarctic MLT region: 15-year observation over Syowa (69S, 39E), IUGG2019, 2019.07.
13. Liu Huixin, Y. Sun, Y. Miyoshi, H. Jin, ENSO effects on MLT diurnal tides: a 21-year reanalysis-drive GAIA model simulation, JpGU2019, 2019.05.
14. Liu Huixin, Y. Sun, Y. Miyoshi, H. Jin, ENSO effects on MLT diurnal tides: a 21-year reanalysis-drive GAIA model simulation, AOGS2018, 2018.06.
15. Liu Huixin, Medium-scale GW activity in bottomside F region
(GPS 通信障害の原因となるプラズマバブルの発生源に迫る), JpGU meeting 2018, international session, 2018.05, Thermospheric gravity waves (GWs) in the bottomside F region have been proposed to play
a key role in the generation of equatorial plasma bubbles (EPBs). However, direct observations of such waves are scarce. This study provides a systematic survey of medium-scale (<620 km) neutral atmosphere perturbations at this critical altitude in the tropics, using 4 years of in situ Gravity Field and Steady-State Ocean Circulation Explorer satellite measurements of thermospheric density and zonal wind. The analysis reveals pronounced features on their global distribution and seasonal variability: (1) A prominent three-peak longitudinal structure exists in all seasons, with stronger perturbations over continents than over oceans. (2) Their seasonal variation consists of a primary semiannual oscillations (SAO) and a secondary annual oscillation (AO). The SAO component maximizes around solstices and minimizes around equinoxes,
while the AO component maximizes around June solstice. These GW features resemble those of EPBs
in spatial distribution but show opposite trend in climatological variations. This may imply that stronger medium-scale GW activity does not always lead to more EPBs. Possible origins of the bottomside GWs are discussed, among which tropical deep convection appears to be most plausible..
16. Liu Huixin, Y. Nakamoto, Y. Miyoshi, Thermosphere response to CO2 doubling: GAIA simulation results, 10th international workshop on Long-term trends, 2018.05.
17. Liu Huixin, Role of Medium-scale GW in seeding plasma bubbles, NIPR symposium 2017, 2017.12.
18. Liu Huixin, Medium-scale GW activity in bottomside F region
, SGEPSS 2017, 2017.10.
19. Liu Huixin, Y. Nakamoto, Y. Miyoshi, Thermosphere response to CO2 doubling: GAIA simulation results, AOGS2017, 2017.08.
20. Liu Huixin, Y. Sun, Y. Miyoshi, H. Jin, ENSO effects on MLT diurnal tides: a 21-year reanalysis-drive GAIA model simulation, AGU-JpGU joint meeting 2017, 2017.05.
21. Liu Huixin, Thermosphere interannual variability: potential fingerprints of QBO and ENSO, JAXA symposium, 2016.12, Interannual variation of the upper atmosphere.
22. Liu Huixin, Thermosphere interannual variability: implications for ENSO and QBO, The International Whole Atmospherear Symposium, 2016.09.
23. Liu Huixin, Thermosphere interannual variability: ENSO effects, Mesosphere-Thermosphere-ionosphere workshop, 2016.08.
24. Liu Huixin, Thermosphere and Ionosphere response to solar flares, VarSITI/ SCOSTEP symposium, 2016.06, This invited talk summarize the thermosphere and ionosphere response to solar flares, and emphasize recent progresses made by satellite observations..
25. Liu Huixin, Thermosphere response to stratosphere sudden warming simulated by GAIA, ISEA2015, 2015.10.
26. K. Oyama, K. Ryu, Liu Huixin, Earthquake Ionosphere Precursor Study Group and Its Role - Toward Strengthening Earthquake Study, AOGS2015, 2015.08.
27. K. Oyama, K. Ryu, Liu Huixin, Diversity of Ionosphere Modification Possibly Caused by Large Earthquakes, AOGS2015, 2015.08.
28. K. Ryu, K. Oyama, Liu Huixin, Contribution of the Mid-Latitude Seismic Activity to the EIA Intensity Variation Suggested by Satellite Electron Density Measurements, AOGS2015, 2015.08.
29. L. Chang, Liu Huixin, Yasunobu Miyoshi, Structure and Origins of the Weddell Sea Anomaly From Tidal and Planetary Wave Signatures in FORMOSAT-3/COSMIC Observations and GAIA GCM Simulations, AOGS2015, 2015.08.
30. N. S. A. Hamid, Liu Huixin, EEJ Empirical Model Based on Ground-Based Magnetometer Data, AOGS2015, 2015.08.
31. Liu Huixin, Periodic Variations in the Thermospheric Density, AOGS2015, 2015.08.
32. Liu Huixin, Thermosphere responses to SSWs simulated by GAIA model, CEDAR 2015, 2015.06.
33. CHIEN, Shin han, CHANG, Loren, Liu Huixin, Variability of the Equatorial Ionization Anomaly on seasonal and day to day time scales, JpGU meeting 2015, international session, 2015.05.
34. Liu Huixin, Periodic variations in the thermospheric density, JpGU meeting 2015, international session, 2015.05.
35. Liu Huixin, Thermal and dynamical response of the thermosphere to stratosphere sudden warming, SCOSTEP 2014, 2014.10.
36. Liu Huixin, Upper atmosphere response to stratosphere sudden warming events, SCOSTEP, 2014.10.
37. G. Maeda, Kiyohumi Yumoto, Liu Huixin, Current Status of the MAGDAS Project - The Largest Magnetometer Array in the World, AOGS2014, 2014.08.
38. J. Jhou, Y. Oyama, C. Lin, Liu Huixin, Ionospheric Response to 2009 Sudden Stratosphere Warming in the Northern and Southern Hemisphere, AOGS2014, 2014.07.
39. M. Förster, Liu Huixin, C. Stolle, Solar Activity and Seasonal Effects of the Upper Atmosphere at High Latitudes According to Observations and Modelling, AOGS2014, 2014.07.
40. Shin Suzuki, J. Park, Y. Otsuka, Liu Huixin, H. Luehr, Coordinated Measurements of Medium-scale Traveling Ionospheric Disturbances with Ground-based Airglow Imagers and CHAMP Satellite, AOGS2014, 2014.07.
41. N. S. A. Hamid, Liu Huixin, Local Time and Longitudinal Dependence of Equatorial Electrojet Calculated from Ground-based Magnetometer, AOGS2014, 2014.07.
42. Liu Huixin, Thermosphere Cooling at Low and Middle Latitudes During Stratosphere Warming Events: GAIA Model Simulations, AOGS2014, 2014.07.
43. Rinako TAKAZAKI, Liu Huixin, Saburo Miyahara, The Ionospheric Sq Current Systems Influenced by Semidiurnal Tide During Sudden Stratospheric Warming Events Simulated by the Kyushu-GCM, AOGS2014, 2014.07.
44. Guo Jianpeng, Liu Huixin, MLT and seasonal dependence of auroral electrojets: IMAGE magnetometer network observations, JpGU meeting 2014, international session, 2014.05.
45. Liu Huixin, Hermann Luehr, Enhancing our understanding of the atmosphere-ionosphere coupling with Low Earth Orbiting satellite missions, JpGU meeting 2014, international session, 2014.04.
46. Liu Huixin, Global mean cooling of the thermosphere during the 2009 major SSW, Scientific committee on Solar-Terrestrial Physics: Internatinoal CAWSES-II symposium, 2013.11.
47. Liu Huixin, Deguchi Ryo, Ionospheric current system derived from CHAMP using DECS method at low and middle latitudes, Scientific committee on Solar-Terrestrial Physics: Internatinoal CAWSES-II symposium, 2013.11.
48. Liu Huixin, Nurul Shazana Abdul Hamid, The equatorial electrojet and global Sq current components at dip equator, Scientific committee on Solar-Terrestrial Physics: Internatinoal CAWSES-II symposium, 2013.11.
49. Liu Huixin, vertical coupling processes in the Earth's system, NASA review panel, 2013.08.
50. Liu Huixin, Thermosphere response to lower atmosphere forcing: decadal observations from the CHAMP mission, Workshop  on  Whole  Atmosphere   Coupling  During  Solar  Cycle  24 , 2013.07.
51. Nurul  Shazana  Abdul  Hamid, Liu Huixin, Brief Study of Equatorial Electrojet and Global Sq Currents At Southeast Asia Region, IEEE International Conference on Space Science and Communication (IconSpace), 2013.07.
52. N. A. A. Hamid, Liu Huixin, Kiyohumi Yumoto, Relation Between the Local Equatorial Electrojet and Global Sq Current Calculated from Different Longitude Sectors, AOGS2013, 2013.06.
53. Nurul  Shazana  Abdul  Hamid, Liu Huixin, Relation Between the Local Equatorial Electrojet and Global Sq Current Calculated from Different Longitude Sectors, Asia Oceania Geosciences Society, 2013.06.
54. Liu Huixin, Upper atmosphere response to stratosphere sudden warming: local time and height dependence simulated by GAIA model, JpGU meeting 2013, international session, 2013.05.
55. Liu Huixin, Mohamad Huzaimy Bin Jusoh, Possible relationship between Solar Wind Input Energy and Seismicity, JpGU meeting 2013, international session, 2013.05.
56. Nurul Shazana Abdul Hamid, Liu Huixin, Relation between the local equatorial electrojet and global Sq current calculated from different longitude sectors, JpGU meeting 2013, international session, 2013.05.
57. Deguchi Ryo, Liu Huixin, Modification of one-dimensional spherical elementary current systems for applying at low/mid latitude, JpGU meeting 2013, international session, 2013.05.
58. Jusoh Mohamad Huzaimy, Liu Huixin, Yumoto Kiyohumi, Investigation on the Possible Relationship between Magnetic Pulsations and Earthquakes, AGU fall meeting 2012, 2012.12.
59. Liu Huixin, Upper thermosphere coupling with the lower atmosphere: the known and unknown, 地球電磁気・地球惑星圏学会, 2012.11.
60. Jusoh Mohamad Huzaimy, Liu Huixin, Yumoto Kiyohumi, Exploration of the Possible Relationship between Magnetic Pulsations and Earthquakes, 地球電磁気・地球惑星圏学会, 2012.11.
61. Shi Run, Liu Huixin, Yoshikawa Akimasa, 1D simulation of Electron acceleration by Inertial Alfven wave pulse, 地球電磁気・地球惑星圏学会, 2012.11.
62. Liu Huixin, Jin, H, Miyoshi Yasunobu, Fujiwara Hitoshi, Shinagawa, H., GAIA model simulation of the thermosphere response to SSW, 地球電磁気・地球惑星圏学会, 2012.11.
63. 田中 大次郎, Liu Huixin, Yumoto Kiyohumi, Seismo-electromagnetic anomalies in ELF range observed by an induction magnetometer in Kuju, 地球電磁気・地球惑星圏学会, 2012.11.
64. ABDUL HAMID NURUL SHAZANA, Liu Huixin, Relation between the local equatorial electrojet and global Sq current system, 地球電磁気・地球惑星圏学会, 2012.11.
65. Liu Huixin, Upper atmosphere response to major and minor stratosphere sudden warming, ISEA13, 2012.03.
66. Liu Huixin, Equatorial electrodynamics and neutral background in the Asian sector during the 2009 Stratosphere sudden warming , AOGS, 2011.08.
67. Liu Huixin, Upper-lower atmosphere coupling: known and unknowns, IUGG 2011 General Assembly, 2011.07.