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Article: Current reduction in a pseudo-breakup event: THEMIS observations

TitleCurrent reduction in a pseudo-breakup event: THEMIS observations
Authors
Keywordscurrent disruption
dipolarization front
fast flow
field-aligned currents
pressure gradient
substorm
Issue Date2014
Citation
Journal of Geophysical Research: Space Physics, 2014, v. 119, n. 10, p. 8178-8187 How to Cite?
AbstractPseudo-breakup events are thought to be generated by the same physical processes as substorms. This paper reports on the cross-tail current reduction in an isolated pseudo-breakup observed by three of the THEMIS probes (THEMIS A (THA), THEMIS D (THD), and THEMIS E (THE)) on 22 March 2010. During this pseudo-breakup, several localized auroral intensifications were seen by ground-based observatories. Using the unique spatial configuration of the three THEMIS probes, we have estimated the inertial and diamagnetic currents in the near-Earth plasma sheet associated with flow braking and diversion. We found the diamagnetic current to be the major contributor to the current reduction in this pseudo-breakup event. During flow braking, the plasma pressure was reinforced, and a weak electrojet and an auroral intensification appeared. After flow braking/diversion, the electrojet was enhanced, and a new auroral intensification was seen. The peak current intensity of the electrojet estimated from ground-based magnetometers, ∼0.7 × 105 A, was about 1 order of magnitude lower than that in a typical substorm. We suggest that this pseudo-breakup event involved two dynamical processes: a current-reduction associated with plasma compression ahead of the earthward flow and a current-disruption related to the flow braking/diversion. Both processes are closely connected to the fundamental interaction between fast flows, the near-Earth ambient plasma, and the magnetic field. Key Points Fundamental interaction between BBFs and ambient plasma has been presentedFlow braking may directly lead to a pseudo-breakupThe compressional effect ahead of fast flow can cause a current disruption
Persistent Identifierhttp://hdl.handle.net/10722/334385
ISSN
2023 Impact Factor: 2.6
2023 SCImago Journal Rankings: 0.845
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorYao, Z. H.-
dc.contributor.authorPu, Z. Y.-
dc.contributor.authorOwen, C. J.-
dc.contributor.authorFu, S. Y.-
dc.contributor.authorChu, X. N.-
dc.contributor.authorLiu, J.-
dc.contributor.authorAngelopoulos, V.-
dc.contributor.authorRae, I. J.-
dc.contributor.authorYue, C.-
dc.contributor.authorZhou, X. Z.-
dc.contributor.authorZong, Q. G.-
dc.contributor.authorCao, X.-
dc.contributor.authorShi, Q. Q.-
dc.contributor.authorForsyth, C.-
dc.contributor.authorDu, A. M.-
dc.date.accessioned2023-10-20T06:47:46Z-
dc.date.available2023-10-20T06:47:46Z-
dc.date.issued2014-
dc.identifier.citationJournal of Geophysical Research: Space Physics, 2014, v. 119, n. 10, p. 8178-8187-
dc.identifier.issn2169-9380-
dc.identifier.urihttp://hdl.handle.net/10722/334385-
dc.description.abstractPseudo-breakup events are thought to be generated by the same physical processes as substorms. This paper reports on the cross-tail current reduction in an isolated pseudo-breakup observed by three of the THEMIS probes (THEMIS A (THA), THEMIS D (THD), and THEMIS E (THE)) on 22 March 2010. During this pseudo-breakup, several localized auroral intensifications were seen by ground-based observatories. Using the unique spatial configuration of the three THEMIS probes, we have estimated the inertial and diamagnetic currents in the near-Earth plasma sheet associated with flow braking and diversion. We found the diamagnetic current to be the major contributor to the current reduction in this pseudo-breakup event. During flow braking, the plasma pressure was reinforced, and a weak electrojet and an auroral intensification appeared. After flow braking/diversion, the electrojet was enhanced, and a new auroral intensification was seen. The peak current intensity of the electrojet estimated from ground-based magnetometers, ∼0.7 × 105 A, was about 1 order of magnitude lower than that in a typical substorm. We suggest that this pseudo-breakup event involved two dynamical processes: a current-reduction associated with plasma compression ahead of the earthward flow and a current-disruption related to the flow braking/diversion. Both processes are closely connected to the fundamental interaction between fast flows, the near-Earth ambient plasma, and the magnetic field. Key Points Fundamental interaction between BBFs and ambient plasma has been presentedFlow braking may directly lead to a pseudo-breakupThe compressional effect ahead of fast flow can cause a current disruption-
dc.languageeng-
dc.relation.ispartofJournal of Geophysical Research: Space Physics-
dc.subjectcurrent disruption-
dc.subjectdipolarization front-
dc.subjectfast flow-
dc.subjectfield-aligned currents-
dc.subjectpressure gradient-
dc.subjectsubstorm-
dc.titleCurrent reduction in a pseudo-breakup event: THEMIS observations-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/2014JA020186-
dc.identifier.scopuseid_2-s2.0-84923316342-
dc.identifier.volume119-
dc.identifier.issue10-
dc.identifier.spage8178-
dc.identifier.epage8187-
dc.identifier.eissn2169-9402-
dc.identifier.isiWOS:000345445400014-

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