Japan Geoscience Union Meeting 2023

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[E] Oral

P (Space and Planetary Sciences ) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM12] Coupling Processes in the Atmosphere-Ionosphere System

Mon. May 22, 2023 1:45 PM - 3:00 PM 106 (International Conference Hall, Makuhari Messe)

convener:Huixin Liu(Earth and Planetary Science Division, Kyushu University SERC, Kyushu University), Yuichi Otsuka(Institute for Space-Earth Environmental Research, Nagoya University), Loren Chang(Department of Space Science and Engineering, National Central University), Yue Deng(University of Texas at Arlington), Chairperson:Christina Arras(TU Berlin, Germany), Atsuki Shinbori(Institute for Space-Earth Environment Research (ISEE), Nagoya University)


2:30 PM - 2:45 PM

[PEM12-29] Horizontal wind effects on the thermospheric composition during the geomagnetic storm

*Tingting Yu1, Zhipeng Ren, Xuguang Cai (1.INSTITUTE OF GEOLOGY AND GEOPHYSICS, CHINESE ACADEMY OF SCIENCES)

Keywords:O/N2, geomagnetic storm, horizontal wind

During the 20 April 2020 geomagnetic storm, a long-lived O/N2 depletion at middle latitudes was observed by GOLD. The observed O/N2 depletion tilts latitudinally with the lowest latitude of ~20° N at ~75° W, and changes orientation near 75° W, with a north-westward tilt to the west of ~75° W and a north-eastward tilt to the east of ~75°W. The TIEGCM shows the similar O/N2 depletion patterns and magnitudes. Furthermore, the global simulation shows a neutral ‘tongue’ structure, which is an area of positive O/N2 variations sandwiched by two regions of negative O/N2 variations. The neutral 'tongue' was gradually transported to dayside accompanied by dissipation, and was also observed by GOLD during the storm recovery phase. Horizontal wind plays a major role in forming the O/N2 depletion and neutral ‘tongue’ structure. For the O/N2 depletion, the high-latitude westward zonal wind and the middle-latitude eastward zonal wind maintained its long existence. While the neutral ‘tongue’ was mainly driven by the poleward wind.