Japan Geoscience Union Meeting 2019

Presentation information

[E] Oral

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

[P-EM12] Space Weather and Space Climate

Mon. May 27, 2019 1:45 PM - 3:15 PM A04 (TOKYO BAY MAKUHARI HALL)

convener:Ryuho Kataoka(National Institute of Polar Research), Antti A Pulkkinen(NASA Goddard Space Flight Center), Kanya Kusano(Institute for Space-Earth Environmental Research, Nagoya University), Kaori Sakaguchi(National Institute of Information and Communications Technology), Chairperson:Antti Pulkkinen(NASA/GSFC)

3:00 PM - 3:15 PM

[PEM12-18] Fan-shaped aurora as seen from Japan during a great magnetic storm on 11 February 1958

*Ryuho Kataoka1, Shiori Uchino1, yasunori Fujiwara1, Shigeru Fujita1, Kazuaki Yamamoto2 (1.National Institute of Polar Research, 2.National Institute of Japanese Literature)

Keywords:aurora, magnetic storm, historical records

A fan-shaped aurora was photographed at Memambetsu, Hokkaido Japan during a great magnetic storm on Feb 11, 1958. This is the first and oldest photograph record of auroras as observed in Japan, and many hand-written drawings were also recorded at the same time during the February 1958 event, giving a rare opportunity of the coexistence of photograph images and hand-written drawings. In fact, the combination of photographs and drawings of the 1958 event reminds us of the great red aurora with fan-shaped white pillars as illustrated during other great magnetic storms in 1872 and in 1770. From the analysis of newly digitized microfilm data, it is also found that the fan-shaped aurora appeared during the peak activity of magnetic storm, and moved westward at 0.4 km/s at 400 km altitude at 38-40 deg magnetic latitudes, which is consistent with the enhanced convection pattern in middle latitude during storm time. Such a fan-shaped aurora can be a fundamental characteristic of middle-latitude evening-to-midnight auroras during great magnetic storms, which show the most destabilized transient appearance of the inner magnetosphere.