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Fast Magnetosonic Waves Observed by Van Allen Probes: Testing Local Wave Excitation Mechanism


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dc.contributorXueyi Wang, wangxue@auburn.eduen_US
dc.creatorMin, Kyungguk
dc.creatorLiu, Kaijun
dc.creatorWang, Xueyi
dc.creatorChen, Lunjin
dc.creatorDenton, Richard E.
dc.date.accessioned2020-05-28T20:57:45Z
dc.date.available2020-05-28T20:57:45Z
dc.date.created2018-01
dc.identifier10.1002/2017JA024867en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2017JA024867en_US
dc.identifier.urihttp://hdl.handle.net/11200/49829
dc.description.abstractLinear Vlasov theory and particle-in-cell (PIC) simulations for electromagnetic fluctuations in a homogeneous, magnetized, and collisionless plasma are used to investigate a fast magnetosonic wave event observed by the Van Allen Probes. The fluctuating magnetic field observed exhibits a series of spectral peaks at harmonics of the proton cyclotron frequency Omega p and has a dominant compressional component, which can be classified as fast magnetosonic waves. Furthermore, the simultaneously observed proton phase space density exhibits positive slopes in the perpendicular velocity space, partial derivative f(p)/partial derivative v(perpendicular to) > 0, which can be a source for these waves. Linear theory analyses and PIC simulations use plasma and field parameters measured in situ except that the modeled proton distribution is modified to have larger partial derivative f(p)/partial derivative v(perpendicular to) under the assumption that the observed distribution corresponds to a marginally stable state when the distribution has already been scattered by the excited waves. The results show that the positive slope is the source of the proton cyclotron harmonic waves at propagation quasi-perpendicular to the background magnetic field, and as a result of interactions with the excited waves the evolving proton distribution progresses approximately toward the observed distribution.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.subjectEQUATORIAL NOISE EMISSIONS; ION BERNSTEIN INSTABILITIES; RADIATION BELT ELECTRONS; SPATIOTEMPORAL VARIABILITY; RESONANT SCATTERING; RING DISTRIBUTIONS; ENERGETIC IONS; ULF WAVES; PROTON; PARTICLEen_US
dc.titleFast Magnetosonic Waves Observed by Van Allen Probes: Testing Local Wave Excitation Mechanismen_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume123en_US
dc.citation.issue1en_US
dc.citation.spage497en_US
dc.citation.epage512en_US
dc.description.statusPublisheden_US
dc.creator.orcid0000-0001-5882-1328en_US
dc.creator.orcid0000-0001-5533-5981en_US

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