Japan Geoscience Union Meeting 2014

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Oral

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

[P-EM37_30PM2] Structure and Dynamics of the Magnetosphere

Wed. Apr 30, 2014 4:15 PM - 5:30 PM 414 (4F)

Convener:*Yoshizumi Miyoshi(Solar-Terrestrial Environement Laboratory, Nagoya University), Hiroshi Hasegawa(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency), Chair:Yoshizumi Miyoshi(Solar-Terrestrial Environement Laboratory, Nagoya University), Shigeru Fujita(Meteorological College, Japan Meteorological Agency)

5:00 PM - 5:15 PM

[PEM37-P01_PG] Auroral vortex, auroral surge, and vortical current in the ionosphere associated with the Pi2 pulsations

3-min talk in an oral session

*Osuke SAKA1, Kanji HAYASHI2 (1.Office Geophysik, 2.U. Tokyo)

Keywords:Aurora dynamics, Pi2 pulsation, Ionospheric current vortex

The auroral breakup event occurred at 0500UT 27 January 1986 in central Canada is studied using all-sky video image from two optical stations (GWR and SHM) and magnetometer data from three ground stations including the optical stations. The spatiotemporal motion of the ionospheric vortical current explained the ground magnetometer data in the auroral zone. During the activation of the current vortex, auroras composed of the shear layers rotating clockwise and the auroral surge propagating westward were observed. It is found that the auroral surge first appeared at the onset latitudes propagated poleward passing through the auroral vortex and became the poleward boundary aurora-surge (PBAS)(1). References1. Saka, O., K. Hayashi, D. Koga (2012), JASTP.