Japan Geoscience Union Meeting 2016

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Poster

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

[P-EM18] Dynamics in magnetosphere and ionosphere

Wed. May 25, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Tomoaki Hori(Institute for Space-Earth Environmental Research, Nagoya University), Yoshimasa Tanaka(National Institute of Polar Research), Aoi Nakamizo(Applied Electromagnetic Research Institute, National Institute of Information and Communications Technology), Mitsunori Ozaki(Faculty of Electrical and Computer Engineering, Institute of Science and Engineering, Kanazawa University), Shin'ya Nakano(The Institute of Statistical Mathematics), Yoshizumi Miyoshi(Institute for Space-Earth Environmental Research, Nagoya University)

5:15 PM - 6:30 PM

[PEM18-P10] Bifurcation of the nightside auroral oval toward the noon during southward IMF

*Masaki Miyamoto1, Satoshi Taguchi1 (1.Department of Geophysics, Kyoto University)

Keywords:polarcap, aurora oval, particle precipitation, southward IMF

We examined the features of the bifurcation of the nightside auroral oval during southward IMF by using remote-sensing measurements made by TIMED/GUVI and in situ observation of the precipitating particles by DMSP spacecraft. Clear bifurcation from the nightside toward the noon sector is seen when IMF is very large and negative. The length of the bifurcated oval is estimated to be approximately 3000 km. We report statistical results on the location of the bifurcation point and the length of the bifurcated oval, including their relationship with IMF conditions.