Selective Acceleration of O+ by Drift-Bounce Resonance in the Earth's Magnetosphere: MMS ObservationsShow others and affiliations
2020 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 125, no 2, article id e2019JA027686Article in journal (Refereed) Published
Abstract [en]
We studied O+ drift-bounce resonance using Magnetospheric Multiscale (MMS) data. A case study of an event on 17 February 2016 shows that O+ flux oscillations at similar to 10-30 keV occurred at MLT similar to 5 hr and L similar to 8-9 during a storm recovery phase. These flux oscillations were accompanied by a toroidal Pc5 wave and a high-speed solar wind (similar to 550 km/s). The azimuthal wave number (m-number) of this Pc5 wave was found to be approximately -2. The O+/H+ flux ratio was enhanced at similar to 10-30 keV corresponding to the O+ flux oscillations without any clear variations of H+ fluxes, indicating the selective acceleration of O+ ions by the drift-bounce resonance. A search for similar events in the time period from September 2015 to March 2017 yielded 12 events. These events were mainly observed in the dawn to the afternoon region at L similar to 7-12 when the solar wind speed is high, and all of them were simultaneously identified on the ground, indicating low m-number. Correlation analysis revealed that the O+/H+ energy density ratio has the highest correlation coefficient with peak power of the electric field in the azimuthal component (E-a). This statistical result supports the selective acceleration of O+ due to the N = 2 drift-bounce resonance.
Place, publisher, year, edition, pages
American Geophysical Union (AGU) , 2020. Vol. 125, no 2, article id e2019JA027686
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-276647DOI: 10.1029/2019JA027686ISI: 000535395800066OAI: oai:DiVA.org:kth-276647DiVA, id: diva2:1444791
Note
QC 20200622
2020-06-222020-06-222022-06-26Bibliographically approved