Longitudinal Structure of Oxygen Torus in the Inner Magnetosphere: Simultaneous Observations by Arase and Van Allen Probe A

Autor: Nosé, M., Matsuoka, A., Kumamoto, A., Kasahara, Y., Goldstein, J., Teramoto, M., Tsuchiya, F., Matsuda, S., Shoji, M., Imajo, S., Oimatsu, S., Yamamoto, K., Obana, Y., Nomura, R., Fujimoto, A., Shinohara, I., Miyoshi, Y., Kurth, W. S., Kletzing, C. A., Smith, C. W., MacDowall, R. J.
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: Geophysical Research Letters. 45(19):10177-10184
ISSN: 0094-8276
Popis: Simultaneous observations of the magnetic field and plasma waves made by the Arase and Van Allen Probe A satellites at different magnetic local time (MLT) enable us to deduce the longitudinal structure of an oxygen torus for the first time. During 04:00–07:10 UT on 24 April 2017, Arase flew from L = 6.2 to 2.0 in the morning sector and detected an enhancement of the average plasma mass up to ~3.5 amu around L = 4.9–5.2 and MLT = 5.0 hr, implying that the plasma consists of approximately 15% O^+ ions. Probe A moved outbound from L = 2.0 to 6.2 in the afternoon sector during 04:10–07:30 UT and observed no clear enhancements in the average plasma mass. For this event, the O^+ density enhancement in the inner magnetosphere (i.e., oxygen torus) does not extend over all MLT but is skewed toward the dawn, being described more precisely as a crescent‐shaped torus or a pinched torus.
ファイル公開：2019-04-16
Databáze: OpenAIRE
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