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Article: Recurrent Magnetic Dipolarization at Saturn: Revealed by Cassini

TitleRecurrent Magnetic Dipolarization at Saturn: Revealed by Cassini
Authors
Keywordsaurora
Cassini
dipolarization
field-aligned current
magnetosphere
Saturn
Issue Date2018
Citation
Journal of Geophysical Research: Space Physics, 2018, v. 123, n. 10, p. 8502-8517 How to Cite?
AbstractPlanetary magnetospheres receive plasma and energy from the Sun or moons of planets and consequently stretch magnetic field lines. The process may last for varied timescales at different planets. From time to time, energy is rapidly released in the magnetosphere and subsequently precipitated into the ionosphere and upper atmosphere. Usually, this energy dissipation is associated with magnetic dipolarization in the magnetosphere.This process is accompanied by plasma acceleration and field-aligned current formation, and subsequently auroral emissions are often significantly enhanced. Using measurements from multiple instruments on board the Cassini spacecraft, we reveal that magnetic dipolarization events at Saturn could reoccur after one planetary rotation and name them as recurrent dipolarizations. Three events are presented, including one from the dayside magnetosphere, which has no known precedent with terrestrial magnetospheric observations. During these events, recurrent energizations of plasma (electrons or ions) were also detected, which clearly demonstrate that these processes shall not be simply attributed to modulation of planetary periodic oscillation, although we do not exclude the possibility that the planetary periodic oscillation may modulate other processes (e.g., magnetic reconnection) which energizes particles. We discuss the potential physical mechanisms for generating the recurrent dipolarization process in a comprehensive view, including aurora and energetic neutral atom emissions.
Persistent Identifierhttp://hdl.handle.net/10722/334564
ISSN
2022 Impact Factor: 2.8
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorYao, Z. H.-
dc.contributor.authorRadioti, A.-
dc.contributor.authorGrodent, D.-
dc.contributor.authorRay, L. C.-
dc.contributor.authorPalmaerts, B.-
dc.contributor.authorSergis, N.-
dc.contributor.authorDialynas, K.-
dc.contributor.authorCoates, A. J.-
dc.contributor.authorArridge, C. S.-
dc.contributor.authorRoussos, E.-
dc.contributor.authorBadman, S. V.-
dc.contributor.authorYe, Sheng Yi-
dc.contributor.authorGérard, J. C.-
dc.contributor.authorDelamere, P. A.-
dc.contributor.authorGuo, R. L.-
dc.contributor.authorPu, Z. Y.-
dc.contributor.authorWaite, J. H.-
dc.contributor.authorKrupp, N.-
dc.contributor.authorMitchell, D. G.-
dc.contributor.authorDougherty, M. K.-
dc.date.accessioned2023-10-20T06:49:02Z-
dc.date.available2023-10-20T06:49:02Z-
dc.date.issued2018-
dc.identifier.citationJournal of Geophysical Research: Space Physics, 2018, v. 123, n. 10, p. 8502-8517-
dc.identifier.issn2169-9380-
dc.identifier.urihttp://hdl.handle.net/10722/334564-
dc.description.abstractPlanetary magnetospheres receive plasma and energy from the Sun or moons of planets and consequently stretch magnetic field lines. The process may last for varied timescales at different planets. From time to time, energy is rapidly released in the magnetosphere and subsequently precipitated into the ionosphere and upper atmosphere. Usually, this energy dissipation is associated with magnetic dipolarization in the magnetosphere.This process is accompanied by plasma acceleration and field-aligned current formation, and subsequently auroral emissions are often significantly enhanced. Using measurements from multiple instruments on board the Cassini spacecraft, we reveal that magnetic dipolarization events at Saturn could reoccur after one planetary rotation and name them as recurrent dipolarizations. Three events are presented, including one from the dayside magnetosphere, which has no known precedent with terrestrial magnetospheric observations. During these events, recurrent energizations of plasma (electrons or ions) were also detected, which clearly demonstrate that these processes shall not be simply attributed to modulation of planetary periodic oscillation, although we do not exclude the possibility that the planetary periodic oscillation may modulate other processes (e.g., magnetic reconnection) which energizes particles. We discuss the potential physical mechanisms for generating the recurrent dipolarization process in a comprehensive view, including aurora and energetic neutral atom emissions.-
dc.languageeng-
dc.relation.ispartofJournal of Geophysical Research: Space Physics-
dc.subjectaurora-
dc.subjectCassini-
dc.subjectdipolarization-
dc.subjectfield-aligned current-
dc.subjectmagnetosphere-
dc.subjectSaturn-
dc.titleRecurrent Magnetic Dipolarization at Saturn: Revealed by Cassini-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1029/2018JA025837-
dc.identifier.scopuseid_2-s2.0-85055677035-
dc.identifier.volume123-
dc.identifier.issue10-
dc.identifier.spage8502-
dc.identifier.epage8517-
dc.identifier.eissn2169-9402-
dc.identifier.isiWOS:000451038700027-

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