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-P03] Variability in the open magnetic flux during superstorms

*Masaki MIYAMOTO1, Satoshi TAGUCHI1 (1.Graduate School of Science, Kyoto University)

Keywords:Polar cap, magnetic flux, superstorm

We report temporal variation of open magnetic flux of the polar cap during the superstorm on 11/20/2003 by using in-situ measurements made by DMSP spacecraft and remote-sensing measurements made by TIMED spacecraft. We examined how the shape of the poleward boundary of the auroral oval changed. Our result shows that the poleward boundary is extremely distorted in the morning sector during the main phase of the superstorm. In the expanding/contracting polar cap paradigm, this sector is not regarded as an important element. We discuss some significant points that are not included in that conventional paradigm.