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-P11] Drifting cusp auroral spot associated with reverse convection

*Yushin Oda1, Satoshi Taguchi1, Keisuke Hosokawa2 (1.Department of Geophysics, Kyoto University, 2.The University of Electro-Communications)

Keywords:aurora, cusp, polar cap, plasma convection, reconnection

We examined features of “drifting cusp auroral spot” by using observations of an auroral form from an all-sky imager at Longyearbyen, Svalbard, and in situ observations of the precipitating particles and plasma flow from DMSP spacecraft that flew over the aurora. Drifting cusp auroral spot means an auroral form that moves to both high and low latitudes during its lifetime. Our result shows that the poleward motion of the drifting cusp auroral spot is associated with sunward plasma flow, i.e., reverse convection. This appears to be inconsistent with a general view of the poleward-moving auroral form. We discuss this seemingly-contradictory motion in terms of lobe reconnection.