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Article: Electron Dynamics in Magnetosheath Mirror-Mode Structures

TitleElectron Dynamics in Magnetosheath Mirror-Mode Structures
Authors
Keywordsbetatron
donut like
electron dynamics
electron pitch angle
mirror mode
MMS
Issue Date2018
Citation
Journal of Geophysical Research: Space Physics, 2018, v. 123, n. 7, p. 5561-5570 How to Cite?
AbstractMirror-mode structures are widely observed in space plasma environments. Although plasma features within the structures have been extensively investigated in theoretical models and numerical simulations, relatively few observational studies have been made, due to a lack of high-cadence measurements of particle distributions in previous space missions. In this work, electron dynamics associated with mirror-mode structures are studied based on Magnetospheric Multiscale observations of electron pitch angle distributions. We define mirror-mode peaks/troughs as the region where the magnetic field strength is greater/smaller than the mean field. The observations show that most electrons are trapped inside the mirror-mode troughs and display a donut-like pitch angle distribution configuration. Besides the trapped electrons in mirror-mode troughs, we find that electrons are also trapped between ambient mirror-mode peaks and coexisting untrapped electrons within the mirror-mode structure. Analysis shows that the observed donut-like electron distributions are the result of betatron cooling and the spatial dependence of electron pitch angles within the structure.
Persistent Identifierhttp://hdl.handle.net/10722/334557
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.authorShi, Q. Q.-
dc.contributor.authorLiu, J.-
dc.contributor.authorYao, Z. H.-
dc.contributor.authorGuo, R. L.-
dc.contributor.authorAhmadi, N.-
dc.contributor.authorDegeling, A. W.-
dc.contributor.authorZong, Q. G.-
dc.contributor.authorWang, X. G.-
dc.contributor.authorTian, A. M.-
dc.contributor.authorRussell, C. T.-
dc.contributor.authorFu, H. S.-
dc.contributor.authorPu, Z. Y.-
dc.contributor.authorFu, S. Y.-
dc.contributor.authorZhang, H.-
dc.contributor.authorSun, W. J.-
dc.contributor.authorLi, L.-
dc.contributor.authorXiao, C. J.-
dc.contributor.authorFeng, Y. Y.-
dc.contributor.authorGiles, B. L.-
dc.date.accessioned2023-10-20T06:48:59Z-
dc.date.available2023-10-20T06:48:59Z-
dc.date.issued2018-
dc.identifier.citationJournal of Geophysical Research: Space Physics, 2018, v. 123, n. 7, p. 5561-5570-
dc.identifier.issn2169-9380-
dc.identifier.urihttp://hdl.handle.net/10722/334557-
dc.description.abstractMirror-mode structures are widely observed in space plasma environments. Although plasma features within the structures have been extensively investigated in theoretical models and numerical simulations, relatively few observational studies have been made, due to a lack of high-cadence measurements of particle distributions in previous space missions. In this work, electron dynamics associated with mirror-mode structures are studied based on Magnetospheric Multiscale observations of electron pitch angle distributions. We define mirror-mode peaks/troughs as the region where the magnetic field strength is greater/smaller than the mean field. The observations show that most electrons are trapped inside the mirror-mode troughs and display a donut-like pitch angle distribution configuration. Besides the trapped electrons in mirror-mode troughs, we find that electrons are also trapped between ambient mirror-mode peaks and coexisting untrapped electrons within the mirror-mode structure. Analysis shows that the observed donut-like electron distributions are the result of betatron cooling and the spatial dependence of electron pitch angles within the structure.-
dc.languageeng-
dc.relation.ispartofJournal of Geophysical Research: Space Physics-
dc.subjectbetatron-
dc.subjectdonut like-
dc.subjectelectron dynamics-
dc.subjectelectron pitch angle-
dc.subjectmirror mode-
dc.subjectMMS-
dc.titleElectron Dynamics in Magnetosheath Mirror-Mode Structures-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1029/2018JA025607-
dc.identifier.scopuseid_2-s2.0-85051092528-
dc.identifier.volume123-
dc.identifier.issue7-
dc.identifier.spage5561-
dc.identifier.epage5570-
dc.identifier.eissn2169-9402-
dc.identifier.isiWOS:000442664300021-

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