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Drift-Bounce Resonance Between Pc5 Pulsations and Ions at Multiple Energies in the Nightside Magnetosphere: Arase and MMS Observations
Kyoto Univ, Grad Sch Sci, Kyoto, Japan..
Kyoto Univ, Grad Sch Sci, Kyoto, Japan..
Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi, Japan..
Kyoto Univ, Grad Sch Sci, Kyoto, Japan..
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2018 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 45, no 15, p. 7277-7286Article in journal (Refereed) Published
Abstract [en]

A Pc5 wave is observed by the Exploration of energization and Radiation in Geospace Arase satellite in the inner magnetosphere (L similar to 5.4-6.1) near postmidnight (L-magnetic local time similar to 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. Plain Language Summary Geomagnetic pulsations are magnetic fluctuations excited by solar wind or plasma instabilities in the magnetosphere. Pc5 waves are continuous geomagnetic pulsations with a period of 150-600 s. A Pc5 wave was observed in the inner magnetosphere during a magnetic storm on 27 March 2017. It propagated westward with a wave number of 8 to 15 and resonated with charged particles, resulting in oscillations of the H+ and O+ ion fluxes at >= 56.3 keV and the O+ ion fluxes at <= 18.6 keV. Resonances of O+ ions at multiple energies are simultaneously observed for the first time. At the same time, the O+/H+ flux ratio at <= 18.6 keV enhanced corresponding to the O+ ion flux oscillations, which indicates selective acceleration of O+ ions through resonances.

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2018. Vol. 45, no 15, p. 7277-7286
National Category
Fusion, Plasma and Space Physics
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URN: urn:nbn:se:kth:diva-235133DOI: 10.1029/2018GL078961ISI: 000443129500005Scopus ID: 2-s2.0-85052570182OAI: oai:DiVA.org:kth-235133DiVA, id: diva2:1249354
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QC 20180919

Available from: 2018-09-19 Created: 2018-09-19 Last updated: 2018-09-19Bibliographically approved

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Lindqvist, Per-Arne

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