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Two-dimensional global hybrid simulation of pressure evolution and waves in the magnetosheath


Metadata FieldValueLanguage
dc.creatorLin, Y
dc.creatorDenton, R
dc.creatorLee, L
dc.creatorChao, J
dc.date.accessioned2022-11-01T20:10:59Z
dc.date.available2022-11-01T20:10:59Z
dc.date.created2001
dc.identifier10.1029/2000JA000232en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2000JA000232en_US
dc.identifier.urihttps://aurora.auburn.edu/handle/11200/50442
dc.identifier.urihttp://dx.doi.org/10.35099/aurora-510
dc.description.abstractA two-dimensional hybrid simulation is carried out for the global structure of the magnetosheath. Quasi-perpendicular magnetosonic/fast mode waves with large-amplitude in-phase oscillations of the magnetic field and the ion density are seen near the bow shock transition. Alfven/ion-cyclotron waves are observed along the streamlines in the magnetosheath, and the wave power peaks in the middle magnetosheath. Antiphase oscillations in the magnetic field and density are present away from the shock transition. Transport ratio analysis suggests that these oscillations result from mirror mode waves. Since fluid simulations are currently best able to model the global magnetosphere and the pressure in the magnetosphere is inherently anisotropic (parallel pressure p parallel to not equal perpendicular pressure pr), it is of some interest to see if a fluid model can be used to predict the anisotropic pressure evolution of a plasma. Here the predictions of double adiabatic theory, the bounded anisotropy model, and the double polytropic model are tested using the two-dimensional hybrid simulation of the magnetosheath. Inputs to the models from the hybrid simulation are the initial post bow shock pressures and the time-dependent density and magnetic field strength along streamlines of the plasma. The success of the models is evaluated on the basis of how well they predict the subsequent evolution of p(parallel to) and P-perpendicular to. The bounded anisotropy model, which encorporates a bound on p(perpendicular to)/p(parallel to) due to the effect of ion cyclotron pitch angle scattering, does a very good job of predicting the evolution of pr; this is evidence that local transfer of energy due to waves is occurring. Further evidence is the positive identification of ion-cyclotron waves in the simulation. The lack of such a good prediction for the evolution of p(parallel to) appears to be due to the model's lack of time dependence for the wave-particle interaction and its neglect of the parallel heat flux. Estimates indicate that these effects will be less significant in the real magnetosheath, though perhaps not negligible.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 YEAR. 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: Lin, Y., Denton, R. E., Lee, L. C., & Chao, J. K. (2001). Two‐dimensional global hybrid simulation of pressure evolution and waves in the magnetosheath. Journal of Geophysical Research: Space Physics, 106(A6), 10691-10704.en_US
dc.titleTwo-dimensional global hybrid simulation of pressure evolution and waves in the magnetosheathen_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume106en_US
dc.citation.issueA6en_US
dc.citation.spage10691en_US
dc.citation.epage10704en_US
dc.description.statusPublisheden_US
dc.description.peerreviewYesen_US
dc.creator.orcid0000-0003-4012-991Xen_US

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