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Article: THEMIS observations of ULF wave excitation in the nightside plasma sheet during sudden impulse events

TitleTHEMIS observations of ULF wave excitation in the nightside plasma sheet during sudden impulse events
Authors
Keywordsplasma sheet
shock
sudden impulse
ultra low frequency wave
vortex
Issue Date2013
Citation
Journal of Geophysical Research: Space Physics, 2013, v. 118, n. 1, p. 284-298 How to Cite?
AbstractSudden impulses (SIs) are an important source of ultra low frequency (ULF) wave activity throughout the Earth's magnetosphere. Most SI-induced ULF wave events have been reported in the dayside magnetosphere; it is not clear when and how SIs drive ULF wave activity in the nightside plasma sheet. We examined the ULF response of the nightside plasma sheet to SIs using an ensemble of 13 SI events observed by THEMIS (Timed History of Events and Macroscale Interactions during Substorms) satellites (probes). Only three of these events resulted in ULF wave activity. The periods of the waves are found to be 3.3, 6.0, and 7.6 min. East-west magnetic and radial electric field perturbations, which typically indicate the toroidal mode, are found to be stronger and can have phase relationships consistent with standing waves. Our results suggest that the two largest-amplitude ULF responses to SIs in the nightside plasma sheet are tailward-moving vortices, which have previously been reported, and the dynamic response of cross-tail currents in the magnetotail to maintain force balance with the solar wind, which has not previously been reported as a ULF wave driver. Both mechanisms could potentially drive standing Alfvén waves (toroidal modes) observed via the field-line resonance mechanism. Furthermore, both involve frequency selection and a preference for certain driving conditions that can explain the small number of ULF wave events associated with SIs in the nightside plasma sheet. © 2012. American Geophysical Union. All Rights Reserved.
Persistent Identifierhttp://hdl.handle.net/10722/334320
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorShi, Q. Q.-
dc.contributor.authorHartinger, M.-
dc.contributor.authorAngelopoulos, V.-
dc.contributor.authorZong, Q. G.-
dc.contributor.authorZhou, X. Z.-
dc.contributor.authorZhou, X. Y.-
dc.contributor.authorKellerman, A.-
dc.contributor.authorTian, A. M.-
dc.contributor.authorWeygand, J.-
dc.contributor.authorFu, S. Y.-
dc.contributor.authorPu, Z. Y.-
dc.contributor.authorRaeder, J.-
dc.contributor.authorGe, Y. S.-
dc.contributor.authorWang, Y. F.-
dc.contributor.authorZhang, H.-
dc.contributor.authorYao, Z. H.-
dc.date.accessioned2023-10-20T06:47:17Z-
dc.date.available2023-10-20T06:47:17Z-
dc.date.issued2013-
dc.identifier.citationJournal of Geophysical Research: Space Physics, 2013, v. 118, n. 1, p. 284-298-
dc.identifier.urihttp://hdl.handle.net/10722/334320-
dc.description.abstractSudden impulses (SIs) are an important source of ultra low frequency (ULF) wave activity throughout the Earth's magnetosphere. Most SI-induced ULF wave events have been reported in the dayside magnetosphere; it is not clear when and how SIs drive ULF wave activity in the nightside plasma sheet. We examined the ULF response of the nightside plasma sheet to SIs using an ensemble of 13 SI events observed by THEMIS (Timed History of Events and Macroscale Interactions during Substorms) satellites (probes). Only three of these events resulted in ULF wave activity. The periods of the waves are found to be 3.3, 6.0, and 7.6 min. East-west magnetic and radial electric field perturbations, which typically indicate the toroidal mode, are found to be stronger and can have phase relationships consistent with standing waves. Our results suggest that the two largest-amplitude ULF responses to SIs in the nightside plasma sheet are tailward-moving vortices, which have previously been reported, and the dynamic response of cross-tail currents in the magnetotail to maintain force balance with the solar wind, which has not previously been reported as a ULF wave driver. Both mechanisms could potentially drive standing Alfvén waves (toroidal modes) observed via the field-line resonance mechanism. Furthermore, both involve frequency selection and a preference for certain driving conditions that can explain the small number of ULF wave events associated with SIs in the nightside plasma sheet. © 2012. American Geophysical Union. All Rights Reserved.-
dc.languageeng-
dc.relation.ispartofJournal of Geophysical Research: Space Physics-
dc.subjectplasma sheet-
dc.subjectshock-
dc.subjectsudden impulse-
dc.subjectultra low frequency wave-
dc.subjectvortex-
dc.titleTHEMIS observations of ULF wave excitation in the nightside plasma sheet during sudden impulse events-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1029/2012JA017984-
dc.identifier.scopuseid_2-s2.0-84878333406-
dc.identifier.volume118-
dc.identifier.issue1-
dc.identifier.spage284-
dc.identifier.epage298-
dc.identifier.eissn2169-9402-
dc.identifier.isiWOS:000317858600027-

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