[P-EM10] Space Weather and Space Climate

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

★Invited Papers

*Yoshizumi Miyoshi¹, Tomoaki Hori¹, Atsuki Shinbori¹, Kazuhiro Yamamoto¹, Chae-Woo Jun¹, Naritoshi Kitamura¹, Iku Shinohara², Kazuo Shiokawa¹, Takeshi Takashima², Kazushi Asamura², Takefumi Mitani², Nana Higashio², Satoshi Kasahara³, Shoichiro Yokota⁴, Sandeep Kumar⁵, Ryuho Kataoka¹¹, Shreedevi Porunakatu Radhakrishna¹, Satoshi Kurita⁶, Yuto Katoh⁷, Kunihiro Keika³, Yoichi Kazama⁸, Shiang Wang⁸, Fuminori Tsuchiya⁷, Atsushi Kumamoto⁷, Yoshiya Kasahara⁹, Shoya Matsuda⁹, Ayako Matsuoka⁶, Mariko Teramoto¹⁰, Shun Imajo⁶ (1.Institute for Space-Earth Environmental Research, Nagoya University, 2.JAXA, 3.University of Tokyo, 4.Osaka University, 5.NASA, 6.Kyoto University, 7.Tohoku University, 8.ASIAA, 9.Kanazawa University, 10.Kyushu Institute for Technology, 11.NIPR)

Keywords:May 2024 storm, Arase satellite, Geospace, Inner magnetosphere

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.