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Article: Ballooning-interchange instability in the near-Earth plasma sheet and auroral beads: Global magnetospheric modeling at the limit of the MHD approximation

TitleBallooning-interchange instability in the near-Earth plasma sheet and auroral beads: Global magnetospheric modeling at the limit of the MHD approximation
Authors
KeywordsGAMERA
ballooning‐interchange
auroral beads
Issue Date2020
PublisherAmerican Geophysical Union. The Journal's web site is located at https://agupubs.onlinelibrary.wiley.com/journal/19448007
Citation
Geophysical Research Letters, 2020, v. 47 n. 14, p. article no. e2020GL088227 How to Cite?
AbstractExplosive magnetotail activity has long been understood in the context of its auroral manifestations. While global models have been used to interpret and understand many magnetospheric processes, the temporal and spatial scales of some auroral forms have been inaccessible to global modeling creating a gulf between observational and theoretical studies of these phenomena. We present here an important step toward bridging this gulf using a newly developed global magnetosphere‐ionosphere model with resolution capturing urn:x-wiley:grl:media:grl60794:grl60794-math-0001 30 km azimuthal scales in the auroral zone. In a global magnetohydrodynamic (MHD) simulation of the growth phase of a synthetic substorm, we find the self‐consistent formation and destabilization of localized magnetic field minima in the near‐Earth magnetotail. We demonstrate that this destabilization is due to ballooning‐interchange instability which drives earthward entropy bubbles with embedded magnetic fronts. Finally, we show that these bubbles create localized field‐aligned current structures that manifest in the ionosphere with properties matching observed auroral beads.
Persistent Identifierhttp://hdl.handle.net/10722/284053
ISSN
2020 Impact Factor: 4.72
2020 SCImago Journal Rankings: 2.007
PubMed Central ID
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorSorathia, KA-
dc.contributor.authorMerkin, VG-
dc.contributor.authorPanov, EV-
dc.contributor.authorZhang, B-
dc.contributor.authorLyon, JG-
dc.contributor.authorGarretson, J-
dc.contributor.authorUkhorskiy, AY-
dc.contributor.authorOhtani, S-
dc.contributor.authorSitnov, M-
dc.contributor.authorWiltberger, M-
dc.date.accessioned2020-07-20T05:55:43Z-
dc.date.available2020-07-20T05:55:43Z-
dc.date.issued2020-
dc.identifier.citationGeophysical Research Letters, 2020, v. 47 n. 14, p. article no. e2020GL088227-
dc.identifier.issn0094-8276-
dc.identifier.urihttp://hdl.handle.net/10722/284053-
dc.description.abstractExplosive magnetotail activity has long been understood in the context of its auroral manifestations. While global models have been used to interpret and understand many magnetospheric processes, the temporal and spatial scales of some auroral forms have been inaccessible to global modeling creating a gulf between observational and theoretical studies of these phenomena. We present here an important step toward bridging this gulf using a newly developed global magnetosphere‐ionosphere model with resolution capturing urn:x-wiley:grl:media:grl60794:grl60794-math-0001 30 km azimuthal scales in the auroral zone. In a global magnetohydrodynamic (MHD) simulation of the growth phase of a synthetic substorm, we find the self‐consistent formation and destabilization of localized magnetic field minima in the near‐Earth magnetotail. We demonstrate that this destabilization is due to ballooning‐interchange instability which drives earthward entropy bubbles with embedded magnetic fronts. Finally, we show that these bubbles create localized field‐aligned current structures that manifest in the ionosphere with properties matching observed auroral beads.-
dc.languageeng-
dc.publisherAmerican Geophysical Union. The Journal's web site is located at https://agupubs.onlinelibrary.wiley.com/journal/19448007-
dc.relation.ispartofGeophysical Research Letters-
dc.rightsGeophysical Research Letters. Copyright © American Geophysical Union.-
dc.rights©[copyright year]. American Geophysical Union. All Rights Reserved. This article is available at https://doi.org/[DOI].-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectGAMERA-
dc.subjectballooning‐interchange-
dc.subjectauroral beads-
dc.titleBallooning-interchange instability in the near-Earth plasma sheet and auroral beads: Global magnetospheric modeling at the limit of the MHD approximation-
dc.typeArticle-
dc.identifier.emailZhang, B: binzh@hku.hk-
dc.identifier.authorityZhang, B=rp02366-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1029/2020GL088227-
dc.identifier.pmid32713979-
dc.identifier.pmcidPMC7375070-
dc.identifier.scopuseid_2-s2.0-85088577065-
dc.identifier.hkuros310832-
dc.identifier.volume47-
dc.identifier.issue14-
dc.identifier.spagearticle no. e2020GL088227-
dc.identifier.epagearticle no. e2020GL088227-
dc.identifier.isiWOS:000556707300018-
dc.publisher.placeUnited States-
dc.identifier.issnl0094-8276-

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