Earth Planets Space, Vol. 56 (No. 12), pp. e41-e44, 2004E-LETTER
Yoh Nakazawa 1, Toshimi Okada 2, and Kazuo Shiokawa 3
1Niigata Prefectural Maki High School, Maki, Niigata 953-0044, Japan
2Faculty of Engineering, Toyama Prefectural University, Kosugi, Toyama 939-0398, Japan
3Solar-Terrestrial Environment Laboratory, Nagoya University, Toyokawa, Aichi 442-8507, Japan
(Received August 24, 2004; Revised October 7, 2004; Accepted December 13, 2004)
"SEKKI" phenomena often appear in the Japanese historical literatures as distinct red emission in the nocturnalsky. The Japanese word "SEKKI" means the red atmosphere. We compile 16 events of SEKKI for 12-19th centuries in the literatures. In order to understand the SEKKI phenomena, we compared 2 events of SEKKI on February 21,
1204, and September 17, 1770, with the characteristics of low-latitude auroras studied recently by modern scientific methods. We conclude that these historical SEKKI phenomena are probably giant low-latitude auroras.
Key words: SEKKI, low-latitude aurora, historical literatures, magnetic storm.