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Hall effect control of magnetotail dawn-dusk asymmetry: A three-dimensional global hybrid simulation


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dc.contributorYu Lin, linyu01@auburn.eduen_US
dc.creatorLu, San
dc.creatorLin, Y.
dc.creatorAngelopoulos, V.
dc.creatorArtemyev, A. V.
dc.creatorPritchett, P. L.
dc.creatorLu, Quanming
dc.creatorWang, Xueyi
dc.date.accessioned2020-06-03T13:23:26Z
dc.date.available2020-06-03T13:23:26Z
dc.date.created2016-12
dc.identifier10.1002/2016JA023325en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2016JA023325en_US
dc.identifier.urihttp://hdl.handle.net/11200/49841
dc.description.abstractMagnetotail reconnection and related phenomena (e.g., flux ropes, dipolarizing flux bundles, flow bursts, and particle injections) occur more frequently on the duskside than on the dawnside. Because this asymmetry can directly result in dawn-dusk asymmetric space weather effects, uncovering its physical origin is important for better understanding, modeling, and prediction of the space weather phenomena. However, the cause of this pervasive asymmetry is unclear. Using three-dimensional global hybrid simulations, we demonstrate that the Hall physics in the magnetotail current sheet is responsible for the asymmetry. The current sheet thins progressively under enhanced global convection; when its thickness reaches ion kinetic scales, some ions are decoupled from the magnetized electrons (the Hall effect). The resultant Hall electric field E-z is directed toward the neutral plane. The Hall effect is stronger (grows faster) on the duskside; i.e., more ions become unmagnetized there and do not comove with the magnetized dawnward E-z x B-x drifting electrons, thus creating a larger additional cross-tail current intensity j(y) (in addition to the diamagnetic current) on the duskside, compared to the dawnside. The stronger Hall effect strength on the duskside is controlled by the higher ion temperature, thinner current sheet, and smaller normal magnetic field B-z there. These asymmetric current sheet properties are in turn controlled by two competing processes that correspond to the Hall effect: (1) the dawnward E x B drift of the magnetic flux and magnetized ions and electrons and (2) the transient motion of the unmagnetized ions which do not execute E x B drift.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.subjectTHIN CURRENT SHEETS; PLASMA SHEET; MAGNETIC RECONNECTION; DYNAMICS; GEOTAIL; TAIL; CLUSTER; DIFFUSION; REGION; MODELen_US
dc.titleHall effect control of magnetotail dawn-dusk asymmetry: A three-dimensional global hybrid simulationen_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume121en_US
dc.citation.issue12en_US
dc.citation.spage11882en_US
dc.citation.epage11895en_US
dc.description.statusPublisheden_US
dc.creator.orcid0000-0001-8003-9252en_US
dc.creator.orcid0000-0001-5533-5981en_US

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