What Erodes the Plasmasphere so Severely? ~A Comparative study of ring current 
fluxes in two moderate geomagnetic storms~

Obana, Yuki; Yoshikawa, Akimasa; Maruyama, Naomi; Shinbori, Atsuki; Nakamura, Satoko; Jun, Chae-Woo; Hori, Tomoaki; Miyoshi, Yoshizumi; Hashimoto, Kumiko K.; Kumamoto, Atsushi; Kitahara, Masahiro; Tsuchiya, Fuminori; Kasahara, Yoshiya; Matsuoka, Ayako; Kazama, Yoichi; Wang, Shiang-Yu; Asamura, Kazushi; Shinohara, Iku; Yokota, Shoichiro; Keika, Kunihiro; Kasahara, Satoshi

doi:10.57757/IUGG23-3169

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What Erodes the Plasmasphere so Severely? ~A Comparative study of ring current fluxes in two moderate geomagnetic storms~

Authors

Obana, Yuki
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Yoshikawa, Akimasa
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Maruyama, Naomi
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Shinbori, Atsuki
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Nakamura, Satoko
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Jun, Chae-Woo
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Hori, Tomoaki
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Miyoshi, Yoshizumi
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Hashimoto, Kumiko K.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Kumamoto, Atsushi
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Kitahara, Masahiro
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Tsuchiya, Fuminori
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Kasahara, Yoshiya
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Matsuoka, Ayako
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Kazama, Yoichi
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Wang, Shiang-Yu
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Asamura, Kazushi
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Shinohara, Iku
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Yokota, Shoichiro
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Keika, Kunihiro
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Kasahara, Satoshi
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Obana, Y., Yoshikawa, A., Maruyama, N., Shinbori, A., Nakamura, S., Jun, C.-W., Hori, T., Miyoshi, Y., Hashimoto, K. K., Kumamoto, A., Kitahara, M., Tsuchiya, F., Kasahara, Y., Matsuoka, A., Kazama, Y., Wang, S.-Y., Asamura, K., Shinohara, I., Yokota, S., Keika, K., Kasahara, S. (2023): What Erodes the Plasmasphere so Severely? ~A Comparative study of ring current fluxes in two moderate geomagnetic storms~, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3169

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020487

Abstract

Using the plasma instruments (LEPi, LEPe, MEPi and MEPe) onboard the Arase satellite, we can comprehensively investigate the fluxes of electrons and ions with different energies. Also, the in-situ electron density can be estimated by using the upper hybrid resonance frequencies detected from the plasma wave spectrum. The geomagnetic storm that commenced on 8 September 2017 has a Dst minimum of -147nT and appears to be a medium-sized magnetic storm at first glance, but it is known that it was a peculiar magnetic storm in various ways. For example, it is an extreme erosion of the plasmasphere to around L=1.5, and a strong SAPS generation. Our previous research suggested that this extreme erosion of the plasmasphere was the result of a convective electric field that continued to penetrate into the magnetic equatorial region for more than 6 hours, however, the reason for the continuation of the convection field was unclear. We therefore compare the evolution of ring current particles during this peculiar magnetic storm to the magnetic storm which commenced on 25 August 2018, which has a similar Dst minimum (-175nT) and erode plasmasphere to around L=2.5.