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Drift‐Bounce Resonance Between Pc5 Pulsations and Ions at Multiple Energies in the Nightside Magnetosphere: Arase and MMS Observations
Author(s) -
Oimatsu S.,
Nosé M.,
Teramoto M.,
Yamamoto K.,
Matsuoka A.,
Kasahara S.,
Yokota S.,
Keika K.,
Le G.,
Nomura R.,
Fujimoto A.,
Sormakov D.,
Troshichev O.,
Tanaka Y.M.,
Shinohara M.,
Shinohara I.,
Miyoshi Y.,
Slavin J. A.,
Ergun R. E.,
Lindqvist P.A.
Publication year - 2018
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2018gl078961
Subject(s) - magnetosphere , physics , resonance (particle physics) , ion , flux (metallurgy) , atomic physics , van allen probes , satellite , local time , van allen radiation belt , schumann resonances , geomagnetic storm , plasmasphere , geophysics , plasma , ionosphere , solar wind , nuclear physics , astronomy , materials science , statistics , mathematics , quantum mechanics , metallurgy
A Pc5 wave is observed by the Exploration of energization and Radiation in Geospace Arase satellite in the inner magnetosphere ( L ~5.4–6.1) near postmidnight ( L ‐magnetic local time ~1.8–2.5 hr) during the storm recovery phase on 27 March 2017. Its azimuthal wave number ( m ‐number) is estimated using two independent methods with satellites and ground observations to be −8 to −15. The direct measurement of the m ‐number enables us to calculate the resonance energy. The flux oscillations of H + and O + ions at ≥ 56.3 keV are caused by drift resonance and those of O + ions at ≤ 18.6 keV by bounce resonance. Resonances of O + ions at multiple energies are simultaneously observed for the first time. The enhancement of the O + /H + flux ratio at ≤ 18.6 keV indicates selective acceleration of O + ions through bounce resonance.