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

Ryuho Kataoka; Yoshizumi Miyoshi; Kazuo Shiokawa; Nozomu Nishitani; Kunihiro Keika; Takanobu Amano; Kanako Seki

Presentation information

[E] Oral

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

[P-EM11] Space Weather and Space Climate

Mon. May 27, 2024 3:30 PM - 4:15 PM Exhibition Hall Special Setting (2) (Exhibition Hall 6, Makuhari Messe)

convener:Ryuho Kataoka(National Institute of Polar Research), Mary Aronne(NASA Goddard Space Flight Center), Yumi Bamba(National Institute of Information and Communications Technology), Antti Pulkkinen(NASA Goddard Space Flight Center), Chairperson:Ryuho Kataoka(National Institute of Polar Research), Mary Aronne

3:30 PM - 3:45 PM

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

*Ryuho Kataoka¹, Yoshizumi Miyoshi², Kazuo Shiokawa², Nozomu Nishitani², Kunihiro Keika³, Takanobu Amano³, Kanako Seki³ (1.National Institute of Polar Research, 2.Nagoya University, 3.The University of Tokyo)

Keywords:citizen science, aurora, magnetic storm

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.