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Global hybrid simulation of mode conversion at the dayside magnetopause


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dc.creatorShi, Feng
dc.creatorLin, Yu
dc.creatorWang, Xueyi
dc.date.accessioned2022-09-28T15:53:23Z
dc.date.available2022-09-28T15:53:23Z
dc.date.created2013
dc.identifier10.1002/jgra.50587en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/jgra.50587en_US
dc.identifier.urihttps://aurora.auburn.edu/handle/11200/50350
dc.identifier.urihttp://dx.doi.org/10.35099/aurora-418
dc.description.abstractMode conversion at the magnetopause has been suggested to lead to the generation of kinetic Alfven waves (KAWs) and effective mass transport from the solar wind into the magnetosphere. To investigate the mode conversion process in the dynamic dayside system, a 3D global hybrid simulation associated with a quasiparallel shock under a radial interplanetary magnetic field (IMF) is carried out, in which the foreshock compressional pulses are selfconsistently generated by the interaction between the solar wind and the geomagnetic field. The results show that as the compressional pulses propagate from the magnetosheath to the magnetopause, shortwavelength structures of k(i)approximate to 0.5-1 with enhanced parallel electric field E-vertical bar are excited in the subsolar magnetopause boundary layer (MPBL), where k similar or equal to k(x) is the perpendicular waves number nearly along the GSE x direction, and (i) is the ion Larmor radius. The wavephase relationship between the magnetic field and the density changes from inphase in the magnetosheath to antiphase in the shortwavelength MPBL perturbations. The wave polarization is predominantly compressive in the magnetosheath, whereas strong transverse wave powers appear abruptly around the MPBL. The mode conversion from the compressional pulses to KAWs is identified around the predicted Alfven resonance surface in the MPBL. As these KAWs evolve, KAW modes dominated by azimuthal wave number with k(yi)approximate to 1 are also generated. The KAWs in the MPBL are identified by the sharp increases in E-vertical bar and the electromagnetic field polarization relations of Alfven mode, as well as a spectral analysis. The KAW perturbations propagate poleward into the cusps along the MPBL. Due to the differential flow convection speeds at various latitudes, the KAW packets expand along the northsouth direction, while they may also merge with newlyformed KAWs due to newlyarrived compressional waves.en_US
dc.formatPDFen_US
dc.relation.ispartofseries2169-9380en_US
dc.rights©American Geophysical Union 2013. This is this the version of record co-published by the American Geophysical Union and John Wiley & Sons, Inc. It is made available under the CC-BY-NC-ND 4.0 license. Item should be cited as: Cable, S., and Y. Lin. "Three‐dimensional MHD simulations of interplanetary rotational discontinuities impacting the Earth's bow shock and magnetosheath." Journal of Geophysical Research: Space Physics 103.A12 (1998): 29551-29567.en_US
dc.titleGlobal hybrid simulation of mode conversion at the dayside magnetopauseen_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume118en_US
dc.citation.issue10en_US
dc.citation.spage6176en_US
dc.citation.epage6187en_US
dc.description.statusPublisheden_US
dc.description.peerreviewYesen_US

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