JpGU-AGU Joint Meeting 2017

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[EE] Oral

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

[P-EM14] [EE] Dynamics in magnetosphere and ionosphere

Sun. May 21, 2017 9:00 AM - 10:30 AM 105 (International Conference Hall 1F)

convener:Tomoaki Hori(Graduate school of Science, University of Tokyo), 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), Chairperson:Atsuki Shinbori(ISEE, Nagoya Univ.), Chairperson:Shin'ya Nakano(The Institute of Statistical Mathematics), Chairperson:Shin-ichiro Oyama(ISEE, Nagoya Univ.)

10:15 AM - 10:30 AM

[PEM14-17] Spatiotemporal variations of the electron precipitation producing moving cusp aurora

*Satoshi Taguchi1, Keisuke Hosokawa2, Yasunobu Ogawa3 (1.Department of Geophysics, Graduate School of Science, Kyoto University, 2.Department of Communication Engineering and Informatics, University of Electro-Communications, 3.National Institute of Polar Research)

Keywords:Aurora, cusp, electron precipitation

A moving mesoscale aurora at a wavelength of 630.0 nm (red line) is a typical phenomenon in the dayside cusp of the high-latitude ionosphere and is thought to be caused by enhanced fluxes of soft magnetosheath electrons in the moving flux tube driven by intermittent reconnection. In this paper we examine the spatiotemporal variations of the electron precipitation in the moving reconnected flux tube by analyzing red-line aurora image data from a ground-based all-sky imager. An analysis taking into account a long radiative time of red-line emission was performed. The long radiative time is the dominant cause of the difference between the extent of the moving red-line aurora and that of the moving electron precipitation. Estimating this difference quantitatively in the aurora image obtained at a time resolution of approximately 10 s reveals the dynamic features of the electron precipitation in the moving reconnected flux tube.