SM041-0007
First observation of source plasma and field variations of a substorm brightening aurora at L=6 by a ground-based EMCCD camera and the Arase satellite on 12 October 2017

Tuesday, 15 December 2020
Poster
Chen Liwei1, Kazuo Shiokawa2, Yoshizumi Miyoshi3, Shun Imajo3, Chae Woo Jun3, Shin-ichiro Oyama3, Yasunobu Ogawa4, Yudai Inaba3, Keisuke Hosokawa5, Yoichi Kazama6, Shiang-Yu Wang7, Sunny W. Y. Tam7, Tzu-Fang Chang8, Bo-Jhou Wang9, Kazushi Asamura10, Satoshi Kasahara10, Shoichiro Yokota11, Tomoaki Hori1, Kunihiro Keika12, Yasumasa Kasaba13, Masafumi Shoji3, Yoshiya Kasahara14, Ayako Matsuoka10, Atsushi Kumamoto15, Fuminori Tsuchiya16 and Iku Shinohara17, (1)Nagoya University, Nagoya, Japan, (2)ISEE, Nagoya Univ, Aichi, Japan, (3)ISEE, Nagoya University, Nagoya, Japan, (4)NIPR National Institute of Polar Research, Tokyo, Japan, (5)Univ Electro-Communications, Chofu, Japan, (6)ASIAA, Taipei, Taiwan, (7)National Cheng Kung University, Tainan, Taiwan, (8)National Cheng-Kung University, Tainan, Taiwan, (9)Academia Sinica Institute of Astronomy and Astrophysics, Taipei, Taiwan, (10)ISAS/JAXA, Sagamihara, Japan, (11)Osaka University, Department of Earth and Space Science, Osaka, Japan, (12)University of Tokyo, Department of Earth and Planetary Science, Bunkyo-ku, Japan, (13)Tohoku University, Sendai, Japan, (14)Kanazawa University, Kanazawa, Japan, (15)Tohoku Univ, Sendai, Japan, (16)PPARC, Tohoku University, Sendai, Japan, (17)JAXA Japan Aerospace Exploration Agency, ISAS, Sagamihara, Japan
Abstract:
In this study we present a special conjugate observation of a substorm brightening aurora event observed by the Arase satellite and a ground-bases EMCCD camera. The event was observed at Tromsø (69.6oN, 19.2oE) on 12 October 2017. Several observational facts indicate the onset of the substorm, including a negative bay of magnetic field H-component at ~1747-1812 UT, a Pi2 pulsation deviated from background H-component original data obtained by mid-latitude magnetograms at ~1748-1802 UT and an auroral kilometric radiation (AKR) recorded by the Arase at ~1749-1800 UT. The magnetic and electric field data show some characteristic variations, and the cross products of them lead to a series of field-aligned Poynting flux toward the ionosphere at the timing around the aurora crossing by the Arase. Field-aligned bi-directional electrons with an energy range between 66-1800 eV were detected by the satellite’s data simultaneously with the appearance of the brightening of auroral arc in the EMCCD camera, which was probably caused by ionospheric electrons from the auroral brightening region. This is the first conjugate observation combined by ground-based substorm aurora observation and in-situ measurement by a satellite in the inner magnetosphere. In the presentation we discuss these observations in terms of the full scene of the substorm in the inner magnetosphere.
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