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One- and two-dimensional hybrid simulations of whistler mode waves in a dipole field


Metadata FieldValueLanguage
dc.contributorKaijun Liuen_US
dc.creatorWu, S.
dc.creatorDenton, R. E.
dc.creatorLiu, Kaijun
dc.creatorHudson, M. K.
dc.date.accessioned2020-06-05T15:49:17Z
dc.date.available2020-06-05T15:49:17Z
dc.date.created2015-03
dc.identifier10.1002/2014JA020736en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2014JA020736en_US
dc.identifier.urihttp://hdl.handle.net/11200/49853
dc.description.abstractWe simulate whistler mode waves using a hybrid code. There are four species in the simulations, hot electrons initialized with a bi-Maxwellian distribution with temperature in the direction perpendicular to background magnetic field greater than that in the parallel direction, warm isotropic electrons, cold inertialess fluid electrons, and protons as an immobile background. The density of the hot population is a small fraction of the total plasma density. Comparison between the dispersion relation of our model and other dispersion relations shows that our model is more accurate for lower frequency whistlers than for higher frequency whistlers. Simulations in 2-D Cartesian coordinates agree very well with those using a full dynamics code. In the 1-D simulations along the dipole magnetic field, the predicted frequency and wave number are observed. Rising tones are observed in the one-fourteenth scale simulations that have larger than realistic magnetic field spatial inhomogeneity. However, in the full-scale 1-D simulation in a dipole field, the waves are more broadband and do not exhibit rising tones. In the 2-D simulations in a meridional plane, the waves are generated with propagation approximately parallel to the background magnetic field. However, the wavefronts become oblique as they propagate to higher latitudes. Simulations with different plasma density profiles across L shell are performed to study the effect of the background density on whistler propagation.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.subjectwhistler waves; particle-in-cell simulation; hybrid simulation; plasma wavesen_US
dc.subjectMAGNETIC-FIELD; MAGNETOSPHERIC CHORUS; BOUNDARY-CONDITIONS; PLASMASPHERIC HISS; VLF EMISSIONS; GENERATION; FREQUENCY; PLASMAen_US
dc.titleOne- and two-dimensional hybrid simulations of whistler mode waves in a dipole fielden_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume120en_US
dc.citation.issue3en_US
dc.citation.spage1908en_US
dc.citation.epage1923en_US
dc.description.statusPublisheden_US
dc.creator.orcid0000-0001-5882-1328en_US

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