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Equatorial Evolution of the Fast Magnetosonic Mode in the Source Region: Observation-Simulation Comparison of the Preferential Propagation Direction


Metadata FieldValueLanguage
dc.contributorKaijun Liuen_US
dc.creatorMin, Kyungguk
dc.creatorBoardsen, Scott A.
dc.creatorDenton, Richard E.
dc.creatorLiu, Kaijun
dc.date.accessioned2020-05-28T20:47:05Z
dc.date.available2020-05-28T20:47:05Z
dc.date.created2018-11
dc.identifier10.1029/2018JA026037en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018JA026037en_US
dc.identifier.urihttp://hdl.handle.net/11200/49825
dc.description.abstractRecent analysis of an event observed by the Van Allen Probes in the source region outside the plasmapause has shown that fast magnetosonic waves (also referred to as equatorial noise) propagate preferentially in the azimuthal direction, implying that wave amplification should occur during azimuthal propagation. To demonstrate this, we carry out 2-D particle-in-cell simulations of the fast magnetosonic mode at the dipole magnetic equator with the simulation box size, the magnetic field inhomogeneity, and the plasma parameters chosen from the same event recently analyzed. The self-consistently evolving electric and magnetic field fluctuations are characterized by spectral peaks at harmonics of the local proton cyclotron frequency. The azimuthal component of the electric field fluctuations is larger than the radial component, indicating wave propagation mainly along the azimuthal direction. Because the simulation box is within the source region, this also implies wave amplification mainly during azimuthal propagation. The excellent agreement between the wave polarization properties of the present simulations and the recently reported observations is clear evidence that the main wave amplification occurs during azimuthal propagation in the source region.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.subjectION BERNSTEIN INSTABILITY; SPATIOTEMPORAL VARIABILITY; WAVE EXCITATION; NOISE; CLUSTER; GENERATION; PROTONen_US
dc.titleEquatorial Evolution of the Fast Magnetosonic Mode in the Source Region: Observation-Simulation Comparison of the Preferential Propagation Directionen_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume123en_US
dc.citation.issue11en_US
dc.citation.spage9532en_US
dc.citation.epage9544en_US
dc.description.statusPublisheden_US
dc.creator.orcid0000-0001-5882-1328en_US

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