Magnetic storm-time red aurora as seen from Hokkaido, Japan on December 1, 2023 associated with high-density solar wind

片岡 龍峰; 三好 由純; 塩川 和夫; 西谷 望; 桂華 邦裕; 天野 孝伸; 関 華奈子

講演情報

[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-EM11] Space Weather and Space Climate

2024年5月27日(月) 15:30 〜 16:15 展示場特設会場 (2) (幕張メッセ国際展示場 6ホール)

コンビーナ:片岡龍峰(国立極地研究所)、Aronne Mary(NASA Goddard Space Flight Center)、伴場由美(国立研究開発法人　情報通信研究機構)、Pulkkinen Antti(NASA Goddard Space Flight Center)、座長:片岡龍峰(国立極地研究所)、Mary Aronne

15:30 〜 15:45

[PEM11-01] Magnetic storm-time red aurora as seen from Hokkaido, Japan on December 1, 2023 associated with high-density solar wind

*片岡龍峰¹、三好由純²、塩川和夫²、西谷望²、桂華邦裕³、天野孝伸³、関華奈子³ (1.国立極地研究所、2.名古屋大学、3.東京大学)

キーワード：市民科学、オーロラ、磁気嵐

We report a citizen science-motivated study on the cause of an unusually bright red aurora as witnessed from Hokkaido, Japan during a magnetic storm on December 1, 2023. Such an intense red aurora event has occurred in the Halloween 2003 super storm, but the Dst index peak of this December 2023 storm was only -107 nT. In spite of the moderate storm amplitude, the extremely high solar wind density of >50 /cc caused the aurora oval extension to 53 MLAT (L=2.8). We discuss that the drift loss of the ring current particles across the small-size magnetopause is important, and Hokkaido was at the right position to see the direct effect of the large particle injection of the storm-time substorm.