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Kinetic Alfven Waves From Magnetotail to the Ionosphere in Global Hybrid Simulation Associated With Fast Flows


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dc.contributorLei Cheng, lzc0025@auburn.eduen_US
dc.creatorCheng, Lei
dc.creatorLin, Yu
dc.creatorPerez, J
dc.creatorJohnson, Jay
dc.creatorWang, Xueyi
dc.date.accessioned2022-09-29T19:12:48Z
dc.date.available2022-09-29T19:12:48Z
dc.date.created2020
dc.identifier10.1029/2019JA027062en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019JA027062en_US
dc.identifier.urihttps://aurora.auburn.edu/handle/11200/50363
dc.identifier.urihttp://dx.doi.org/10.35099/aurora-431
dc.description.abstractWe have used the Auburn Global Hybrid Code in 3-D to study the generation, dynamics, and global structure of kinetic Alfven waves (KAWs) from the magnetotail to the ionosphere. Our results show that KAWs are generated in magnetic reconnection in the plasma sheet, located around fast flows, and carrying transverse electromagnetic perturbations, parallel Poynting fluxes, parallel currents, and parallel electric field. Overall, shear Alfvenic turbulent spectrum is found in the plasma sheet. The KAWs are shear Alfven waves possessing short perpendicular wavelength with k(perpendicular to)rho(i) similar to 1, where k(perpendicular to) is the perpendicular wave number and rho(i) the ion Larmor radius. The KAWs are identified by their dispersion relation and polarizations. The structures of these KAWs embedded in the plasma sheet are also revealed by placing a virtual satellite in the tail. In order to understand whether the Poynting fluxes carried by the shear Alfven waves/KAWs in the plasma sheet can be carried directly along field lines to the ionosphere, we have tracked the wave propagation from the plasma sheet to the ionosphere. It is found that in front of the flow-braking region, the structure and strength of the shear Alfven waves are significantly altered due to interaction with the dipole-like field, mainly by the flow shear associated with the azimuthal convection. Also in front of the dipole-like field region, ion kinetic effects (Hall effects) lead to the generation of additional pairs of KAWs. As such, the generation and transport of the shear Alfven waves/KAWs to the ionosphere are illustrated for the first time in a comprehensive manner on the global scale.en_US
dc.formatPDFen_US
dc.relation.ispartofseries2169-9380en_US
dc.rights©American Geophysical Union 2020. 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: Cheng, Lei, et al. "Kinetic Alfvén waves from magnetotail to the ionosphere in global hybrid simulation associated with fast flows." Journal of Geophysical Research: Space Physics 125.2 (2020): e2019JA027062.en_US
dc.titleKinetic Alfven Waves From Magnetotail to the Ionosphere in Global Hybrid Simulation Associated With Fast Flowsen_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume125en_US
dc.citation.issue2en_US
dc.description.statusPublisheden_US
dc.description.peerreviewYesen_US
dc.creator.orcid0000-0002-9562-1103en_US
dc.creator.orcid0000-0002-5619-9093en_US

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