[P-EM10] Space Weather and Space Climate

[PEM10-24] Geospace response to the May 2024 geomagnetic storm: Insights from Arase observations

★Invited Papers

*三好 由純¹、堀 智昭¹、新堀 淳樹¹、山本 和弘¹、Jun Chae-Woo¹、北村 成寿¹、篠原 育²、塩川 和夫¹、高島 健²、浅村 和史²、三谷 烈史²、東尾 奈々²、笠原 慧³、横田 勝一郎⁴、Kumar Sandeep⁵、片岡 龍峰¹¹、Radhakrishna Shreedevi ¹、栗田 怜⁶、加藤 雄人⁷、桂華 邦裕³、風間 洋一⁸、Wang Shiang⁸、土屋 史紀⁷、熊本 篤志⁷、笠原 禎也⁹、松田 昇也⁹、松岡 彩子⁶、寺本 万里子¹⁰、今城 峻⁶ (1.名古屋大学宇宙地球環境研究所、2.宇宙航空研究開発機構、3.東京大学、4.大阪大学、5.NASA、6.京都大学、7.東北大学、8.ASIAA、9.金沢大学、10.九州工業大学、11.国立極地研究所)

キーワード：2024年5月宇宙嵐、あらせ衛星、ジオスペース、内部磁気圏

In May 2024, during the largest geomagnetic storm of Solar Cycle 25, the Arase satellite successfully conducted observations with all instruments and captured remarkable phenomena within the geospace. The observations revealed significant magnetospheric deformation in response to an increase in solar wind dynamic pressure, as well as particle acceleration caused by a strong interplanetary shock. Furthermore, Arase detected compositional changes in ring current ions and recorded the largest enhancement of relativistic electrons since its launch. This presentation highlights key findings from the Arase satellite, providing new insights into the geospace response to extreme space weather events.