日本地球惑星科学連合2025年大会

講演情報

印刷

[E] 口頭発表

セッション記号 P (宇宙惑星科学) » P-EM 太陽地球系科学・宇宙電磁気学・宇宙環境

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

2025年5月26日(月) 09:00 〜 10:30 303 (幕張メッセ国際会議場)

コンビーナ:細川 敬祐(電気通信大学大学院情報理工学研究科)、Liu Huixin(九州大学理学研究院地球惑星科学専攻 九州大学宙空環境研究センター)、大塚 雄一(名古屋大学宇宙地球環境研究所)、Chang Loren(Institute of Space Science, National Central University)、座長:Chang Loren(Institute of Space Science, National Central University)、Lin Charles(Department of Earth Sciences, National Cheng Kung University)

10:00 〜 10:15

[PEM12-23] Sporadic-E layer responses to super geomagnetic storm 10-12 May 2024

*Lihui Qiu1、Huixin Liu1 (1.Kyushu University)

キーワード：sporadic E layers, Geomagnetic storm

Sporadic E (Es) layer plays a prominent role in revealing both upward and downward atmosphere-ionosphere coupling process. This study investigates the responses of Es layers to the May 2024 super geomagnetic storm by using 37 ground-based ionosondes distributed globally and space-based COSMIC-2 radio occultation observations. The results show that Es layers were significantly enhanced on daytime during the recovery phase of geomagnetic storm. In addition, the enhanced Es layers mainly occurred over Southeast Asia, Australia, the South Pacific and the East Pacific. The temporal evolution of foEs disturbances over the Asian-Australian sector clearly shows the “wave propagation” characteristics from high to low latitudes, indicating that the enhancements of the Es layers are most likely caused by the disturbed neutral winds in the E region. This study presents observational evidence for the downward impacts of the geomagnetic storm on the E-region ionosphere.