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Ion Acceleration Inside Foreshock Transients


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dc.contributorYu Lin, linyu01@auburn.eduen_US
dc.creatorLiu, Terry Z.
dc.creatorLu, San
dc.creatorAngelopoulos, Vassilis
dc.creatorLin, Yu
dc.creatorWang, X. Y.
dc.date.accessioned2020-05-28T20:56:15Z
dc.date.available2020-05-28T20:56:15Z
dc.date.created20188-01
dc.identifier10.1002/2017JA024838en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2017JA024838en_US
dc.identifier.urihttp://hdl.handle.net/11200/49828
dc.description.abstractRecent observations upstream of Earth's bow shock have revealed that foreshock transients can not only accelerate solar wind ions by reflection at their upstream boundaries but may also accelerate ions inside them. Evidence for the latter comes from comparisons of ion spectra inside and outside the cores, and from evidence of leakage of suprathermal ions from the cores. However, definite evidence for, and the physics of, ion acceleration in the foreshock transients are still open questions. Using case studies of foreshock transients from Time History of Events and Macroscale Interactions during Substorms observations, we reveal an ion acceleration mechanism in foreshock transients that is applicable to similar to 25% of the transients. The ion energy flux is enhanced between several keV to tens of keV in the cores. We show that these energetic ions are reflected at the earthward moving boundary of foreshock transients, are accelerated through partial gyration along the convection electric field, and can leak out both upstream and downstream of the foreshock transients. Using ions moving self-consistently with a generic 3-D global hybrid simulation of a foreshock transient, we confirm this physical picture of ion acceleration and leakage. These accelerated ions could be further accelerated at the local bow shock and repopulate the foreshock, increasing the efficacy of solar wind-magnetosphere interactions.en_US
dc.formatPDFen_US
dc.publisherAMER GEOPHYSICAL UNIONen_US
dc.relation.ispartofJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICSen_US
dc.relation.ispartofseries2169-9380en_US
dc.subjectHOT FLOW ANOMALIES; GLOBAL HYBRID SIMULATION; BOW SHOCK; MAGNETOSHEATH; MAGNETOPAUSE; CAVITIES; BUBBLES; CORES; WINDen_US
dc.titleIon Acceleration Inside Foreshock Transientsen_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume123en_US
dc.citation.issue1en_US
dc.citation.spage163en_US
dc.citation.epage178en_US
dc.description.statusPublisheden_US
dc.creator.orcid0000-0001-8003-9252en_US

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