SM037-12
Identifying the Physical Mechanisms to Explain the Extreme Plasmaspheric Erosion for the September 2017 Storm

Monday, 14 December 2020: 19:33
Virtual
Naomi Maruyama1, Cristian Ferradas2, Mei-Ching Hannah Fok3, Andrew Menz4, Yuki Obana5, Michael G Henderson6, Brian T Kress7, Samuel Califf8, Scott Thaller9, Atsuki Shinbori10, Kumiko K. Hashimoto11, Masahito Nose12, Yuichi Otsuka13, Nozomu Nishitani14, Tomoaki Hori15, Atsushi Kumamoto16, Fuminori Tsuchiya17, Syoya Matsuda18, Ayako Matsuoka18, Yoshiya Kasahara19, Akimasa Yoshikawa20, Yoshizumi Miyoshi13 and Iku Shinohara21, (1)University of Colorado at Boulder, Boulder, CO, United States, (2)New Mexico Consortium, Los Alamos, NM, United States, (3)NASA Goddard Space Flight Center, Heliophysics Division, Greenbelt, MD, United States, (4)University of New Hampshire, Durham, NH, United States, (5)Osaka Electro-Communicat. Univ, Osaka, Japan, (6)Los Alamos National Laboratory, Los Alamos, NM, United States, (7)University of Colorado, Boulder, CO, United States, (8)NOAA Boulder, Solar Terrestrial Physics, Boulder, United States, (9)LASP/CU, Boulder, United States, (10)Kyoto University, Kyoto, Japan, (11)Kibi International University, Okayama, Japan, (12)Nagoya Univeristy, Institute for Space-Earth Environmental Research, Nagoya, Japan, (13)ISEE, Nagoya University, Nagoya, Japan, (14)Nagoya University, Nagoya, Japan, (15)Nagoya Univ. STE lab., Nagoya, Aichi, Japan, (16)Tohoku University, Sendai, Japan, (17)PPARC, Tohoku University, Sendai, Japan, (18)ISAS/JAXA, Sagamihara, Japan, (19)Kanazawa University, Kanazawa, Japan, (20)Kyushu University, Faculty of Science, Fukuoka, Japan, (21)JAXA Japan Aerospace Exploration Agency, ISAS, Sagamihara, Japan
Abstract:
An extreme erosion of the plasmasphere (LPP < 2) occurred during the September 2017 storm. The cold electron density is identified from the upper limit frequency of upper hybrid resonance waves observed by the Plasma Wave Experiment instrument onboard the Exploration of energization and Radiation in Geospace/Arase satellite. The electron density profiles reveal that the plasmasphere was severely eroded during the recovery phase of the storm and the plasmapause was located at L = 1.6–1.7 at 23 UT 8 September 2017. The degree of the severity is much more than what is expected from the relatively moderate value of the SYM‐H minimum (−146 nT). Observations of ground-based magnetometers near the magnetic equator indicate a long duration penetration electric field. It is not fully understood why the penetration electric field lasted for several hours and whether the long duration penetration electric field was actually responsible for the extreme erosion. In this presentation, we will address these questions by using numerical simulations of a combination of two physics-based models: the Ionosphere-Plasmasphere-Electrodynamics (IPE) model and Comprehensive Inner Magnetosphere Ionosphere (CIMI) model.
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