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Two-Dimensional gcPIC Simulation of Rising-Tone Chorus Waves in a Dipole Magnetic Field


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dc.contributorXueyi Wang, xywang@physics.auburn.eduen_US
dc.creatorLu, Quanming
dc.creatorKe, Yangguang
dc.creatorWang, Xueyi
dc.creatorLiu, Kaijun
dc.creatorGao, Xinliang
dc.creatorChens, Lunjin
dc.creatorWang, Shui
dc.date.accessioned2020-05-26T18:16:15Z
dc.date.available2020-05-26T18:16:15Z
dc.date.created2019-06
dc.identifier10.1029/2019JA026586en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019JA026586en_US
dc.identifier.urihttp://hdl.handle.net/11200/49819
dc.description.abstractRising-tone chorus waves have already been successfully produced in a mirror magnetic field with the use of one- and two-dimensional particle-in-cell (PIC) simulations. However, in reality, the background magnetic field in the inner Earth's magnetosphere is a dipole magnetic field, unlike symmetric mirror fields. In this paper, with the two-dimensional (2-D) general curvilinear PIC (gcPIC) code, we investigate the generation of rising-tone chorus waves in the dipole magnetic field configuration. The plasma consists of three components: immobile ions, cold background, and hot electrons. In order to save computational resource, the topology of the magnetic field is roughly equal to that at L = 0.6 R-E, although the plasma parameters corresponding to those at L = 6 R-E (R-E is the Earth's radius) are used. Whistler mode waves are first excited around the magnetic equator by the hot electrons with a temperature anisotropy. The excited whistler mode waves propagate almost parallel and antiparallel to the background magnetic field in their source region, which is limited at vertical bar lambda vertical bar <= 3 degrees (where lambda is the magnetic latitude). When the waves leave from the source region and propagate toward high latitudes, both their amplitude and wave normal angle become larger. However, the group velocity of the waves is directed toward high latitudes almost along the magnetic field. During such a process, the waves have a frequency chirping, as shown by a rising tone in the frequency-time spectrogram. To our best knowledge, it is for the first time that rising-tone chorus are generated in a dipole magnetic field with a PIC simulation.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.subjectVAN ALLEN PROBES; RADIATION-BELT ELECTRONS; RESONANT DIFFUSION; ELF/VLF CHORUS; SOURCE-REGION; VLF CHORUS; ACCELERATION; PRECIPITATION; GENERATION; SCATTERINGen_US
dc.titleTwo-Dimensional gcPIC Simulation of Rising-Tone Chorus Waves in a Dipole Magnetic Fielden_US
dc.typeCollectionen_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume124en_US
dc.citation.issue6en_US
dc.citation.spage4157en_US
dc.citation.epage4167en_US
dc.description.statusPublisheden_US

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