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Particle-in-Cell Simulations of the Fast Magnetosonic Mode in a Dipole Magnetic Field: 1-D Along the Radial Direction


Metadata FieldValueLanguage
dc.contributorKaijun Liuen_US
dc.creatorMin, Kyungguk
dc.creatorLiu, Kaijun
dc.creatorDenton, Richard E.
dc.creatorBoardsen, Scott A.
dc.date.accessioned2020-05-28T20:51:12Z
dc.date.available2020-05-28T20:51:12Z
dc.date.created2018-09
dc.identifier10.1029/2018JA025666en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018JA025666en_US
dc.identifier.urihttp://hdl.handle.net/11200/49826
dc.description.abstractAn electromagnetic particle-in-cell code is used to investigate self-consistent evolution of the fast magnetosonic mode in a one-dimensional configuration along the radial direction in a dipole background magnetic field. A previous observation of this wave mode is used to select the simulation parameters. A partial shell velocity distribution of energetic protons with a moderate pitch angle anisotropy is used to excite the waves self-consistently. Consistent with local linear theory analysis, wave growth occurs only at exact harmonics of the local proton cyclotron frequency, Omega(p). However, radial propagation quickly removes the waves from the region where they can grow, leading to a time scale of wave amplification much longer than that predicted by linear theory. In addition, radial propagation from multiple wave sources makes the frequency spectrum measured at a single point much broader. The warm background plasma plays an important role in two ways. First, it increases the phase speed of the fast magnetosonic mode; and second, it causes the breakup of the extraordinary mode dispersion relation in the vicinity of the harmonics, where the broken dispersion curves are connected with multiple ion Bernstein modes. In this case, the waves propagating radially are absorbed at locations where their frequency reaches integer multiples of Omega(p) and background protons experience perpendicular heating at those locations.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.subjectfast magnetosonic mode in the inner magnetosphere; 1-D PIC simulations in radial direction; electromagnetic PIC code in dipole geometryen_US
dc.subjectVAN ALLEN PROBES; EQUATORIAL NOISE; EARTHS MAGNETOSPHERE; INNER MAGNETOSPHERE; CLUSTER SPACECRAFT; RING DISTRIBUTIONS; WAVE EXCITATION; PROPAGATION; ANISOTROPY; FREQUENCYen_US
dc.titleParticle-in-Cell Simulations of the Fast Magnetosonic Mode in a Dipole Magnetic Field: 1-D Along the Radial Directionen_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume123en_US
dc.citation.issue9en_US
dc.citation.spage7424en_US
dc.citation.epage7440en_US
dc.description.statusPublisheden_US
dc.creator.orcid0000-0001-5882-1328en_US

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