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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.creatorFu, Xiangrong
dc.creatorCowee, Misa
dc.creatorFriedel, Reinhard
dc.creatorFunsten, Herbert
dc.creatorGary, S
dc.creatorHospodarsky, George
dc.creatorKletzing, Craig
dc.creatorKurth, William
dc.creatorLarsen, Brian
dc.creatorLiu, Kaijun
dc.creatorMacDonald, Elizabeth
dc.creatorMin, Kyungguk
dc.creatorReeves, Geoffrey
dc.creatorSkoug, Ruth
dc.creatorWinske, Dan
dc.date.accessioned2023-01-25T19:28:37Z
dc.date.available2023-01-25T19:28:37Z
dc.date.created2014
dc.identifier10.1002/2014JA020364en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2014JA020364en_US
dc.identifier.urihttps://aurora.auburn.edu/handle/11200/50487
dc.identifier.urihttp://dx.doi.org/10.35099/aurora-555
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.publisherAmerican Geophysical Unionen_US
dc.relation.ispartofJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICSen_US
dc.relation.ispartofseries2169-9380en_US
dc.rights©American Geophysical Union 2014. This is this the version of record co-published by the American Geophysical Union and John Wiley & Sons, Inc. It is made available under the CC-BY-NC-ND 4.0 license. Item should be cited as: Fu, X., Cowee, M. M., Friedel, R. H., Funsten, H. O., Gary, S. P., Hospodarsky, G. B., ... & Winske, D. (2014). Whistler anisotropy instabilities as the source of banded chorus: Van Allen Probes observations and particle‐in‐cell simulations. Journal of Geophysical Research: Space Physics, 119(10), 8288-8298.en_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.description.peerreviewYesen_US
dc.creator.orcid0000-0003-3117-4030en_US
dc.creator.orcid0000-0002-7985-8098en_US
dc.creator.orcid0000-0002-6817-1039en_US
dc.creator.orcid0000-0002-5228-0281en_US
dc.creator.orcid0000-0003-4515-0208en_US
dc.creator.orcid0000-0001-5882-1328en_US
dc.creator.orcid0000-0003-3117-4030en_US
dc.creator.orcid0000-0002-5471-6202en_US
dc.creator.orcid0000-0001-5882-1328en_US
dc.creator.orcid0000-0002-4305-6624en_US
dc.creator.orcid0000-0001-9200-9878en_US
dc.creator.orcid0000-0002-4136-3348en_US
dc.creator.orcid0000-0003-1991-2643en_US

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