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dc.contributor.authorBirn, J.
dc.contributor.authorHesse, Michael
dc.contributor.authorBingham, S.T.
dc.contributor.authorTurner, D.L.
dc.contributor.authorNakamura, Rumi
dc.date.accessioned2022-04-01T13:43:32Z
dc.date.available2022-04-01T13:43:32Z
dc.date.created2022-01-31T13:02:10Z
dc.date.issued2021
dc.identifier.issn2169-9380
dc.identifier.urihttps://hdl.handle.net/11250/2989348
dc.description.abstractThis paper represents the second part of an investigation of the acceleration of energetic oxygen ions from encounters with a dipolarization front (DF), based on test particle tracing in the fields of an MHD simulation. In this paper, we focus on distributions in the plasma sheet boundary layer (PSBL). O+ beams close to the plasma sheet boundary are found to be less pronounced and/or delayed against the H+ beams. The reason is that these particles are accelerated by nonadiabatic motion in the duskward electric field such that O+ ions gain the same amount of energy, but only 1/4 of the speed of protons. This causes a delay and larger equatorward displacement by the E × B drift. In contrast, the O+ beams somewhat deeper inside the plasma sheet, where previously multiple proton beams were found, are accelerated at an earthward propagating DF just like H+, forming a field-aligned beam at a similar speed as the lowest-energy H+ beam. We found that the source location depends on the adiabaticity of the orbit. For larger adiabaticity, the beam ions originate initially from the outer plasma sheet, but later from the opposite PSBL or lobe, but for low adiabaticity, sources are well inside the plasma sheet. The energy gained from a single encounter of a DF is comparable to the kinetic energy associated with the front speed. Assuming maximum speeds of 500–1,000 km/s, this yields a mass dependent acceleration of about 1–5 keV for protons and 20–80 keV for oxygen ions, independent of their charge state.en_US
dc.language.isoengen_US
dc.publisherAGUen_US
dc.titleAcceleration of Oxygen Ions in Dipolarization Events: 1. CPS Distributionsen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.description.versionpublishedVersionen_US
dc.rights.holderCopyright 2021. American Geophysical Union. All Rights Reserved.en_US
dc.source.articlenumbere2021JA029143en_US
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2
dc.identifier.doi10.1029/2021JA029143
dc.identifier.cristin1994694
dc.source.journalJournal of Geophysical Research (JGR): Space Physicsen_US
dc.identifier.citationJournal of Geophysical Research (JGR): Space Physics. 2021, 126 (7), e2021JA029143.en_US
dc.source.volume126en_US
dc.source.issue7en_US


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