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Whistler anisotropy instabilities as the source of banded chorus: Van Allen Probes observations and particle-in-cell simulations


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dc.contributorKaijun Liuen_US
dc.creatorFu, Xiangrong
dc.creatorLiu, Kaijun
dc.creatorMin, Kyungguk
dc.creatorWinske, Dan
dc.date.accessioned2020-06-05T19:32:50Z
dc.date.available2020-06-05T19:32:50Z
dc.date.created2014-10
dc.identifier10.1002/2014JA020364en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2014JA020364en_US
dc.identifier.urihttp://hdl.handle.net/11200/49858
dc.description.abstractMagnetospheric banded chorus is enhanced whistler waves with frequencies (r)<(e), where (e) is the electron cyclotron frequency, and a characteristic spectral gap at (r)similar or equal to(e)/2. This paper uses spacecraft observations and two-dimensional particle-in-cell simulations in a magnetized, homogeneous, collisionless plasma to test the hypothesis that banded chorus is due to local linear growth of two branches of the whistler anisotropy instability excited by two distinct, anisotropic electron components of significantly different temperatures. The electron densities and temperatures are derived from Helium, Oxygen, Proton, and Electron instrument measurements on the Van Allen Probes A satellite during a banded chorus event on 1 November 2012. The observations are consistent with a three-component electron model consisting of a cold (a few tens of eV) population, a warm (a few hundred eV) anisotropic population, and a hot (a few keV) anisotropic population. The simulations use plasma and field parameters as measured from the satellite during this event except for two numbers: the anisotropies of the warm and the hot electron components are enhanced over the measured values in order to obtain relatively rapid instability growth. The simulations show that the warm component drives the quasi-electrostatic upper band chorus and that the hot component drives the electromagnetic lower band chorus; the gap at approximate to(e)/2 is a natural consequence of the growth of two whistler modes with different properties.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.subjectchorus; particle-in-cell simulation; HOPE; Van Allen Probesen_US
dc.subjectRADIATION-BELT ELECTRONS; MAGNETOSPHERIC CHORUS; ACCELERATION; WAVES; EMISSIONSen_US
dc.titleWhistler anisotropy instabilities as the source of banded chorus: Van Allen Probes observations and particle-in-cell simulationsen_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume119en_US
dc.citation.issue10en_US
dc.citation.spage8288en_US
dc.citation.epage8298en_US
dc.description.statusPublisheden_US
dc.creator.orcid0000-0001-5882-1328en_US
dc.creator.orcid0000-0002-2095-8529en_US

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