Japan Geoscience Union Meeting 2015

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Poster

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

[P-EM28] Dynamics in magnetosphere and ionosphere

Wed. May 27, 2015 6:15 PM - 7:30 PM Convention Hall (2F)

Convener:*Yoshizumi Miyoshi(Solar-Terrestrial Environement Laboratory, Nagoya University), Hiroshi Hasegawa(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency), Shin'ya Nakano(The Institute of Statistical Mathematics), Yoshimasa Tanaka(National Institute of Polar Research), Tomoaki Hori(Nagoya University Solar Terrestrial Environment Laboratory Geospace Research Center)

6:15 PM - 7:30 PM

[PEM28-P02] Postnoon aurora spot and poleward-drifting multiple arcs

*Yohei TSUJIMOTO1, Satoshi TAGUCHI1, Keisuke HOSOKAWA2, Yasunobu OGAWA3 (1.Graduate School of Science, Kyoto Univ., 2.Graduate School of Informatics and Engineering, Univ. of Electro-Communications, 3.National Institute of Polar Research)

Keywords:High-latitude ionosphere, postnoon aurora spot, auroral arc, all-sky imager

To understand when and how the postnoon aurora spot is created, we examined data from the all-sky imager installed in Longyearbyen, Svalbard. From the detailed examination of the data obtained during two winter seasons (2013-2014, and 2014-2015), we have found that the postnoon aurora spot consists of poleward-drifting multiple arcs, which happened at intervals of about 2 min. In some events, each poleward-drifting arc distorts into a folding structure at the final stage of the poleward drift, and becomes even brighter. We report the characteristics of the occurrence and motion of the poleward-drifting arcs, and discuss what is important for the creation of the postnoon aurora spot.