Field-Aligned Electron Density Distribution of the Inner Magnetosphere Inferred From Coordinated Observations of Arase and Van Allen Probes

Yuki Obana; Yukinaga Miyashita; Naomi Maruyama; Atsuki Shinbori; Masahito Nose; Masafumi Shoji; Atsushi Kumamoto; Fuminori Tsuchiya; Shoya Matsuda; Ayako Matsuoka; Yoshiya Kasahara; Yoshizumi Miyoshi; Iku Shinohara; William S. Kurth; Charles W. Smith; Robert J. MacDowall

doi:10.1029/2020JA029073

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Field-Aligned Electron Density Distribution of the Inner Magnetosphere Inferred From Coordinated Observations of Arase and Van Allen Probes

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Field-Aligned Electron Density Distribution of the Inner Magnetosphere Inferred From Coordinated Observations of Arase and Van Allen Probes

Yuki Obana, Yukinaga Miyashita, Naomi Maruyama, Atsuki Shinbori, Masahito Nose, Masafumi Shoji, Atsushi Kumamoto, Fuminori Tsuchiya, Shoya Matsuda, Ayako Matsuoka, …

Journal of geophysical research. Space physics, Vol.126(10), e2020JA029073

10/01/2021

DOI: 10.1029/2020JA029073

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Abstract

The Radiation Belt Storm Probes (RBSP) and the Arase satellites have different inclinations and sometimes they fly both near the equator and off the equator on the same magnetic field line simultaneously. Such conjunction events give us opportunities to compare the electron density at different latitudes. In this study, we analyzed the plasma waves observed by Arase and RBSP during the three conjunction events during and after the September 7, 2017 storm. The electron number density at the satellite positions was estimated from frequencies of the Upper Hybrid Resonance emissions obtained by the High Frequency Analyzer of the Plasma Wave Experiment onboard the Arase and the Waves instrument onboard the RBSP, respectively. During the three conjunction events, the satellites passed through the plume, inner trough (the narrow region with low electron density between the main body of the plasmasphere and the plume), plasmatrough with variable electron density, and partially refilled plasmasphere. The power-law index m for the inner trough and plume was inferred to be 4-7 and similar to 0, respectively. This is interpreted to mean that the trough was close to collisionless and the plume was relatively near diffusive equilibrium. In the plasmatrough with the varying density, both the high-density and low-density regions had m similar to 0. The low-density portion of this region may have a different origin from the inner trough, because of the different m indices. For the partially refilled plasmasphere in the storm recovery phase, the power-law index m showed negative values, meaning that the density in the equatorial plane was higher than at higher latitudes.

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Title: Subtitle: Field-Aligned Electron Density Distribution of the Inner Magnetosphere Inferred From Coordinated Observations of Arase and Van Allen Probes
Creators: Yuki Obana - Osaka Electro-Communication University
Yukinaga Miyashita - Korea Astronomy and Space Science Institute
Naomi Maruyama - University of Colorado Boulder
Atsuki Shinbori - Nagoya University
Masahito Nose - Nagoya University
Masafumi Shoji - Nagoya University
Atsushi Kumamoto - Tohoku University
Fuminori Tsuchiya - Tohoku University
Shoya Matsuda - Japan Aerospace Exploration Agency
Ayako Matsuoka - Kyoto University
Yoshiya Kasahara - Kanazawa University
Yoshizumi Miyoshi - Nagoya University
Iku Shinohara - Japan Aerospace Exploration Agency
William S. Kurth - University of Iowa
Charles W. Smith - University of New Hampshire
Robert J. MacDowall - Goddard Space Flight Center
Resource Type: Journal article
Publication Details: Journal of geophysical research. Space physics, Vol.126(10), e2020JA029073
DOI: 10.1029/2020JA029073
ISSN: 2169-9380
eISSN: 2169-9402
Publisher: Amer Geophysical Union
Number of pages: 13
Grant note: 15H05815; 15H05747; 16H04057; 17H00728; 19H01958; 20H01959 / JSPS KAKENHI; Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT); Japan Society for the Promotion of Science; Grants-in-Aid for Scientific Research (KAKENHI) 921647; NAS5-01072 / NASA through JHU/APL
Language: English
Date published: 10/01/2021
Academic Unit: Physics and Astronomy
Record Identifier: 9984455543002771

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