Substructure of a Kelvin-Helmholtz Vortex Accompanied by Plasma Transport Under the Northward Interplanetary Magnetic Field

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dc.contributor.authorYan, G. Q.
dc.contributor.authorMozer, F. S.
dc.contributor.authorParks, G. K.
dc.contributor.authorCai, C. L.
dc.contributor.authorChen, T.
dc.contributor.authorGoldstein, Melvyn
dc.contributor.authorRen, Y.
dc.date.accessioned2022-08-25T15:00:05Z
dc.date.available2022-08-25T15:00:05Z
dc.date.issued2022-02-15
dc.description.abstractWithin a Kelvin-Helmholtz (K-H) vortex at the duskside magnetopause, a substructure characterized by two flux enhancements of cold magnetosheath plasma in a background of hot magnetosphere plasma is observed. The substructure is accompanied by plasma transport across the magnetopause, and the transport region is found to split into two parts: the double peaks in both ion and electron densities, corresponding to the two flux enhancements in spectrograms. There are two decreases in the ion temperature while the electron temperature remains constantly low, suggesting that the substructure is caused by a secondary process within the vortex rather than the secondary crossings of the vortex or the boundary oscillations. A transverse motion of cold plasma is observed in the pitch-angle distribution, demonstrating an example of transverse driving and ongoing plasma transport across the magnetopause. With the convective electric field removed, the perturbed electric field E1, which is sinusoidal and perpendicular to B, matches the theoretical prediction of the Rayleigh-Taylor (R-T) instability. Such a perturbed electric field is expected to be the electrostatic field that accompanies the R-T instability producing the substructure and drives the plasma transport by urn:x-wiley:21699380:media:jgra57043:jgra57043-math-0001 drift. The observations suggest that this secondary R-T instability within the K-H vortex can drive plasma transport across the magnetopause.en_US
dc.description.sponsorshipThis work was supported by the National Natural Science Foundation of China, Grant Nos. 41731070, 41574161, 41574159, 41004074, and 41904148, and by the Strategic Pioneer Program on Space Science, Chinese Academy of Sciences, Grant Nos. XDA15052500, No. XDA15350201, No. XDA17010301. The Authors are grateful to the NASA's Goddard Flight Center and the associated THEMIS instrument teams for supplying the data and the software. The Authors thank Academician Chi Wang and Professor Lei Dai for valuable scientific discussions. The authors also thank the supports from the Specialized Research Fund for State Key Laboratories and CAS-NSSC-135 project.en_US
dc.description.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2021JA029735en_US
dc.format.extent16 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2ex7u-ye4z
dc.identifier.citationYan, G. Q., Mozer, F. S., Parks, G. K., Cai, C. L., Chen, T., Goldstein, M. L., & Ren, Y. (2022). Substructure of a Kelvin-Helmholtz vortex accompanied by plasma transport under the northward interplanetary magnetic field. Journal of Geophysical Research: Space Physics, 127, e2021JA029735. https://doi.org/10.1029/2021JA029735en_US
dc.identifier.urihttps://doi.org/10.1029/2021JA029735
dc.identifier.urihttp://hdl.handle.net/11603/25566
dc.language.isoen_USen_US
dc.publisherAGUen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Goddard Planetary Heliophysics Institute (GPHI)
dc.relation.ispartofUMBC Faculty Collection
dc.rightsŠ2018. American Geophysical Union. All Rights Reserved.en_US
dc.titleSubstructure of a Kelvin-Helmholtz Vortex Accompanied by Plasma Transport Under the Northward Interplanetary Magnetic Fielden_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0002-5317-988Xen_US

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