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Regime transition of ion Bernstein instability driven by ion shell velocity distributions


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dc.contributorKyungguk Min, kmin@auburn.eduen_US
dc.creatorMin, Kyungguk
dc.creatorLiu, Kaijun
dc.date.accessioned2022-09-29T15:06:11Z
dc.date.available2022-09-29T15:06:11Z
dc.date.created2015
dc.identifier10.1002/2015JA021514en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2015JA021514en_US
dc.identifier.urihttps://aurora.auburn.edu/handle/11200/50357
dc.identifier.urihttp://dx.doi.org/10.35099/aurora-425
dc.description.abstractLinear kinetic dispersion theory is used to investigate a regime transition of the ion Bernstein instability driven by a proton velocity distribution with positive slopes with respect to the perpendicular velocity, f(p)(v(vertical bar)approximate to 0,v)/v>0. The unstable waves arising from this instability are ion Bernstein waves with proton cyclotron harmonic dispersion. However, in the inner magnetosphere, particularly inside of the plasmapause where plasmas are dominated by a cold background, the instability leads to ion Bernstein waves which approximately follow the cold plasma dispersion relation for fast magnetosonic waves and are, therefore, fast magnetosonic-like. Subsequently, the relevant waves have been termed fast magnetosonic waves and many studies have assumed the cold plasma dispersion relation to describe them. On the other hand, how the dispersion properties of ion Bernstein waves become fast magnetosonic-like has not yet been well understood. To examine this regime transition of the instability, we perform linear dispersion analyses using a two-component proton model of f(p)(v) = f(M)(v) + f(s)(v), where f(M) is a Maxwellian velocity distribution and f(s) is an isotropic shell velocity distribution. The results show that the unstable waves are essentially ion Bernstein waves; however, when the shell proton concentration becomes sufficiently small (less than 10), the unstable waves approach the cold plasma dispersion relation for fast magnetosonic waves and become fast magnetosonic-like. Although a reduced proton-to-electron mass ratio of 100 has been used for convenience, which reduces the number of unstable modes involved by lowering the lower hybrid frequency, this does not change the overall regime transition picture revealed in this study.en_US
dc.formatPDFen_US
dc.relation.ispartofseries2169-9380en_US
dc.rights©American Geophysical Union 2015. 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: Min, Kyungguk, and Kaijun Liu. "Regime transition of ion Bernstein instability driven by ion shell velocity distributions." Journal of Geophysical Research: Space Physics 120.10 (2015): 8448-8454.en_US
dc.titleRegime transition of ion Bernstein instability driven by ion shell velocity distributionsen_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume120en_US
dc.citation.issue10en_US
dc.citation.spage8448en_US
dc.citation.epage8454en_US
dc.description.statusPublisheden_US
dc.description.peerreviewYesen_US
dc.creator.orcid0000-0001-5882-1328en_US

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