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Proton velocity ring-driven instabilities and their dependence on the ring speed: Linear theory


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dc.creatorMin, Kyungguk
dc.creatorLiu, Kaijun
dc.creatorGary, Peter
dc.date.accessioned2022-10-12T18:49:09Z
dc.date.available2022-10-12T18:49:09Z
dc.date.created2017
dc.identifier10.1002/2017JA023944en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2017JA023944en_US
dc.identifier.urihttps://aurora.auburn.edu/handle/11200/50392
dc.identifier.urihttp://dx.doi.org/10.35099/aurora-460
dc.description.abstractLinear dispersion theory is used to study the Alfven-cyclotron, mirror and ion Bernstein instabilities driven by a tenuous (1%) warm proton ring velocity distribution with a ring speed, v(r), varying between 2v(A) and 10v(A), where v(A) is the Alfven speed. Relatively cool background protons and electrons are assumed. The modeled ring velocity distributions are unstable to both the Alfven-cyclotron and ion Bernstein instabilities whose maximum growth rates are roughly a linear function of the ring speed. The mirror mode, which has real frequency omega(r)=0, becomes the fastest growing mode for sufficiently large v(r)/v(A). The mirror and Bernstein instabilities have maximum growth at propagation oblique to the background magnetic field and become more field-aligned with an increasing ring speed. Considering its largest growth rate, the mirror mode, in addition to the Alfven-cyclotron mode, can cause pitch angle diffusion of the ring protons when the ring speed becomes sufficiently large. Moreover, because the parallel phase speed, v(vertical bar ph), becomes sufficiently small relative to v(r), the low-frequency Bernstein waves can also aid the pitch angle scattering of the ring protons for large v(r). Potential implications of including these two instabilities at oblique propagation on heliospheric pickup ion dynamics are discussed.en_US
dc.formatPDFen_US
dc.relation.ispartofseries2169-9380en_US
dc.rights©American Geophysical Union 2017. 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, Kaijun Liu, and S. Peter Gary. "Proton velocity ring‐driven instabilities and their dependence on the ring speed: Linear theory." Journal of Geophysical Research: Space Physics 122.8 (2017): 7891-7906.en_US
dc.titleProton velocity ring-driven instabilities and their dependence on the ring speed: Linear theoryen_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume122en_US
dc.citation.issue8en_US
dc.citation.spage7891en_US
dc.citation.epage7906en_US
dc.description.statusPublisheden_US
dc.description.peerreviewYesen_US
dc.creator.orcid0000-0002-4655-2316en_US
dc.creator.orcid0000-0001-5882-1328en_US

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