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Global hybrid simulation of the dayside reconnection layer and associated field-aligned currents


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dc.contributorYu Lin, linyu0@auburn.eduen_US
dc.creatorLin, Y.
dc.date.accessioned2020-06-26T20:12:48Z
dc.date.available2020-06-26T20:12:48Z
dc.date.created2001-11
dc.identifier10.1029/2000JA000184en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2000JA000184en_US
dc.identifier.urihttp://hdl.handle.net/11200/49902
dc.description.abstractA two-dimensional global hybrid simulation is carried out to study the structure of the magnetopause boundary layer in the noon-midnight meridian plane associated with the dayside reconnection. In the simulation the bow shock, magnetosheath, and magnetopause are formed self-consistently by supersonic solar wind passing the geomagnetic field. The dayside reconnection is triggered by imposing a current-dependent resistivity at the subsolar magnetopause. A large-amplitude rotational discontinuity is formed in the quasi-steady reconnection layer in the northern and southern hemispheres. The rotational discontinuity possesses an electron sense, or right-hand polarization in the magnetic field as the discontinuity is formed from the X line, and the magnetic structures in the magnetopause northward and southward of the X line are asymmetric in the cases with a nonzero B-y component of the interplanetary magnetic field (IMF). However, later the rotational discontinuity tends to evolve to a structure with a smallest field rotational angle and thus may reverse its sense of the field rotation. The Walen relation is tested for electron and ion flows in the magnetopause rotational discontinuities with left-hand and right-hand polarizations. Field-aligned currents are generated in the magnetopause rotational discontinuity during the reconnection, and nearly 5% of the magnetopause currents propagate with Alfven waves along the field lines into the polar ionosphere. In addition, a weak secondary rotational discontinuity or Alfven wave pulse propagates from the reconnection site into the magnetosphere. The sense of the field-aligned currents is investigated for various values of the IMF B-y. The Hall effects on the structure of the magnetopause boundary layer and the field-aligned currents are discussed.en_US
dc.formatPDFen_US
dc.publisherAMER GEOPHYSICAL UNIONen_US
dc.relation.ispartofJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICSen_US
dc.relation.ispartofseries0148-0227en_US
dc.subjectINTERPLANETARY MAGNETIC-FIELD; LOW-LATITUDE RECONNECTION; FLUX-TRANSFER EVENTS; ROTATIONAL DISCONTINUITIES; ALFVEN WAVES; EARTHS MAGNETOPAUSE; SOLAR-WIND; CUSP OBSERVATIONS; NORTHWARD IMF; GENERATIONen_US
dc.titleGlobal hybrid simulation of the dayside reconnection layer and associated field-aligned currentsen_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume106en_US
dc.citation.issueA11en_US
dc.description.statusPublisheden_US
dc.creator.orcid0000-0001-8003-9252en_US

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