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Article: Observations of kinetic-size magnetic holes in the magnetosheath

TitleObservations of kinetic-size magnetic holes in the magnetosheath
Authors
Keywordsdiamagnetic drift
electron flow vortex
kinetic size
magnetic hole
magnetosheath
soliton
Issue Date2017
Citation
Journal of Geophysical Research: Space Physics, 2017, v. 122, n. 2, p. 1990-2000 How to Cite?
AbstractMagnetic holes (MHs), with a scale much greater than ρi (proton gyroradius), have been widely reported in various regions of space plasmas. On the other hand, kinetic-size magnetic holes (KSMHs), previously called small-size magnetic holes, with a scale of the order of magnitude of or less than ρi have only been reported in the Earth's magnetospheric plasma sheet. In this study, we report such KSMHs in the magnetosheath whereby we use measurements from the Magnetospheric Multiscale mission, which provides three-dimensional (3-D) particle distribution measurements with a resolution much higher than previous missions. The MHs have been observed in a scale of 10–20 ρe (electron gyroradii) and lasted 0.1–0.3 s. Distinctive electron dynamics features are observed, while no substantial deviations in ion data are seen. It is found that at the 90° pitch angle, the flux of electrons with energy 34–66 eV decreased, while for electrons of energy 109–1024 eV increased inside the MHs. We also find the electron flow vortex perpendicular to the magnetic field, a feature self-consistent with the magnetic depression. Moreover, the calculated current density is mainly contributed by the electron diamagnetic drift, and the electron vortex flow is the diamagnetic drift flow. The electron magnetohydrodynamics soliton is considered as a possible generation mechanism for the KSMHs with the scale size of 10–20 ρe.
Persistent Identifierhttp://hdl.handle.net/10722/334466
ISSN
2023 Impact Factor: 2.6
2023 SCImago Journal Rankings: 0.845
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorYao, S. T.-
dc.contributor.authorWang, X. G.-
dc.contributor.authorShi, Q. Q.-
dc.contributor.authorPitkänen, T.-
dc.contributor.authorHamrin, M.-
dc.contributor.authorYao, Z. H.-
dc.contributor.authorLi, Z. Y.-
dc.contributor.authorJi, X. F.-
dc.contributor.authorDe Spiegeleer, A.-
dc.contributor.authorXiao, Y. C.-
dc.contributor.authorTian, A. M.-
dc.contributor.authorPu, Z. Y.-
dc.contributor.authorZong, Q. G.-
dc.contributor.authorXiao, C. J.-
dc.contributor.authorFu, S. Y.-
dc.contributor.authorZhang, H.-
dc.contributor.authorRussell, C. T.-
dc.contributor.authorGiles, B. L.-
dc.contributor.authorGuo, R. L.-
dc.contributor.authorSun, W. J.-
dc.contributor.authorLi, W. Y.-
dc.contributor.authorZhou, X. Z.-
dc.contributor.authorHuang, S. Y.-
dc.contributor.authorVaverka, J.-
dc.contributor.authorNowada, M.-
dc.contributor.authorBai, S. C.-
dc.contributor.authorWang, M. M.-
dc.contributor.authorLiu, J.-
dc.date.accessioned2023-10-20T06:48:20Z-
dc.date.available2023-10-20T06:48:20Z-
dc.date.issued2017-
dc.identifier.citationJournal of Geophysical Research: Space Physics, 2017, v. 122, n. 2, p. 1990-2000-
dc.identifier.issn2169-9380-
dc.identifier.urihttp://hdl.handle.net/10722/334466-
dc.description.abstractMagnetic holes (MHs), with a scale much greater than ρi (proton gyroradius), have been widely reported in various regions of space plasmas. On the other hand, kinetic-size magnetic holes (KSMHs), previously called small-size magnetic holes, with a scale of the order of magnitude of or less than ρi have only been reported in the Earth's magnetospheric plasma sheet. In this study, we report such KSMHs in the magnetosheath whereby we use measurements from the Magnetospheric Multiscale mission, which provides three-dimensional (3-D) particle distribution measurements with a resolution much higher than previous missions. The MHs have been observed in a scale of 10–20 ρe (electron gyroradii) and lasted 0.1–0.3 s. Distinctive electron dynamics features are observed, while no substantial deviations in ion data are seen. It is found that at the 90° pitch angle, the flux of electrons with energy 34–66 eV decreased, while for electrons of energy 109–1024 eV increased inside the MHs. We also find the electron flow vortex perpendicular to the magnetic field, a feature self-consistent with the magnetic depression. Moreover, the calculated current density is mainly contributed by the electron diamagnetic drift, and the electron vortex flow is the diamagnetic drift flow. The electron magnetohydrodynamics soliton is considered as a possible generation mechanism for the KSMHs with the scale size of 10–20 ρe.-
dc.languageeng-
dc.relation.ispartofJournal of Geophysical Research: Space Physics-
dc.subjectdiamagnetic drift-
dc.subjectelectron flow vortex-
dc.subjectkinetic size-
dc.subjectmagnetic hole-
dc.subjectmagnetosheath-
dc.subjectsoliton-
dc.titleObservations of kinetic-size magnetic holes in the magnetosheath-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/2016JA023858-
dc.identifier.scopuseid_2-s2.0-85013679063-
dc.identifier.volume122-
dc.identifier.issue2-
dc.identifier.spage1990-
dc.identifier.epage2000-
dc.identifier.eissn2169-9402-
dc.identifier.isiWOS:000397022900038-

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