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Generation of dynamic pressure pulses downstream of the bow shock by variations in the interplanetary magnetic field orientation


Metadata FieldValueLanguage
dc.creatorLin, Y.
dc.creatorLee, L.C.
dc.creatorYan, M.
dc.date.accessioned2022-10-25T17:57:46Z
dc.date.available2022-10-25T17:57:46Z
dc.date.created1996
dc.identifier10.1029/95JA02985en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/95JA02985en_US
dc.identifier.urihttps://aurora.auburn.edu/handle/11200/50418
dc.identifier.urihttp://dx.doi.org/10.35099/aurora-486
dc.description.abstractOne-dimensional resistive MHD and hybrid simulations are carried out to study the manner by which variations of the interplanetary magnetic field (IMF) direction generate dynamic pressure pulses in the magnetosheath. The reaction of the magnetosheath to the temporal IMF variation is modeled as the interaction between the bow shock (BS) and an interplanetary rotational discontinuity (RD), an Alfven wave pulse (AW), or an Alfven wave train. The resistive MHD simulation indicates that the arrival of an RD produces two time-dependent intermediate shocks (TDISs) and two slow shocks downstream of the bow shock, which propagate through the magnetosheath toward the Earth's magnetopause. An enhancement of plasma density is present throughout the TDISs and slow shocks. A plasma dynamic pressure pulse is formed in this region. In the hybrid simulation, the two TDISs are replaced by rotational discontinuities. For a bow shock with a shock normal angle Theta(Bn) > 45 degrees, the pulse in the dynamic pressure rho V-2 causes the the total pressure (P + B-2/2 mu(0) + rho V-2) in the magnetosheath to increases by about 0-100% of the background value. The strength of the pressure pulse increases with the field rotation angle across the incident rotational discontinuity, while it decreases with the Mach number or upstream plasma beta of the bow shock. The pressure pulse propagates toward the magnetopause with nearly a constant amplitude. On the other hand, the BS/AW interaction leads to the generation of Alfven waves downstream of the bow shock, and large-amplitude dynamic pressure pulses are generated in the downstream Alfven wave. Pressure pulses impinging on the magnetopause may produce magnetic impulse events (MIEs) observed in the high-latitude ionosphere.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 1996. 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., Lee, L. C., & Yan, M. (1996). Generation of dynamic pressure pulses downstream of the bow shock by variations in the interplanetary magnetic field orientation. Journal of Geophysical Research: Space Physics, 101(A1), 479-493.en_US
dc.titleGeneration of dynamic pressure pulses downstream of the bow shock by variations in the interplanetary magnetic field orientationen_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume101en_US
dc.citation.issueA1en_US
dc.citation.spage479en_US
dc.citation.epage493en_US
dc.description.statusPublisheden_US
dc.description.peerreviewYesen_US
dc.creator.orcid0000-0003-4012-991Xen_US

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