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Reversal of magnetic field rotation in the reconnection layer due to shear flow effects


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dc.contributorYu Lin, linyu01@auburn.eduen_US
dc.creatorSun, Xiaoxia
dc.creatorLin, Yu
dc.creatorWang, Xiaogang
dc.date.accessioned2020-06-18T20:55:16Z
dc.date.available2020-06-18T20:55:16Z
dc.date.created2006-11
dc.identifier10.1029/2006JA011812en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2006JA011812en_US
dc.identifier.urihttp://hdl.handle.net/11200/49885
dc.description.abstractWe investigate the effects of shear flows on the so-called "component reconnection," in which the guide field B-y not equal 0, by solving a one-dimensional Riemann problem for magnetopause reconnection using a resistive MHD simulation. Specifically, we consider the existence of a shear flow perpendicular to the antiparallel magnetic field B-z, while a finite shear flow tangential to B-z may also be present. In the cases without a magnetosheath flow and having thus a sheared flow across the reconnection layer, two time-dependent intermediate shocks TDIS and TDIS' are present on the magnetosheath side and the magnetospheric side, respectively, and the strength of TDIS is much stronger than that of TDIS'. Nevertheless, the existence of the shear flows modifies the structure and strength of the time-dependent intermediate shocks significantly. (1) The perpendicular shear flow V-y0 can lead to the reversal of the rotation sense of the tangential magnetic field in time-dependent intermediate shocks. The critical shear flow speeds, V-c and V-c', for the reversal of field rotations in TDIS and TDIS', respectively, are calculated. (2) For shear flow speed V-y0 = V-c, the strong TDIS is replaced by a steady intermediate shock (IS), whereas at V-y0 = V-c' an Alfven wave pulse is present in the reconnection layer. (3) The presence of tangential shear flow V-z0 alters not only the strength of TDIS and TDIS' but also the critical speeds V-c and V-c'. The critical shear flow speeds obtained from our simulation are found to agree very well with those from the ideal magnetohydrodynamics (MHD), in which the time-dependent intermediate shocks are replaced by rotational discontinuities.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.subjectINTERMEDIATE SHOCKS; TAIL MAGNETOPAUSE; PLASMA; SIMULATION; MHDen_US
dc.titleReversal of magnetic field rotation in the reconnection layer due to shear flow effectsen_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume111en_US
dc.citation.issueA11en_US
dc.description.statusPublisheden_US
dc.creator.orcid0000-0001-8003-9252en_US

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