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Article: Magnetosphere sawtooth oscillations induced by ionospheric outflow

TitleMagnetosphere sawtooth oscillations induced by ionospheric outflow
Authors
Issue Date2011
Citation
Science, 2011, v. 332, n. 6034, p. 1183-1186 How to Cite?
AbstractThe sawtooth mode of convection of Earth's magnetosphere is a 2- to 4-hour planetary-scale oscillation powered by the solar wind-magnetosphere-ionosphere (SW-M-I) interaction. Using global simulations of geospace, we have shown that ionospheric O + outflows can generate sawtooth oscillations. As the outflowing ions fill the inner magnetosphere, their pressure distends the nightside magnetic field. When the outflow fluence exceeds a threshold, magnetic field tension cannot confine the accumulating fluid; an O + -rich plasmoid is ejected, and the field dipolarizes. Below the threshold, the magnetosphere undergoes quasi-steady convection. Repetition and the sawtooth period are controlled by the strength of the SW-M-I interaction, which regulates the outflow fluence.
Persistent Identifierhttp://hdl.handle.net/10722/250972
ISSN
2017 Impact Factor: 41.058
2015 SCImago Journal Rankings: 13.217
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorBrambles, O. J.-
dc.contributor.authorLotko, W.-
dc.contributor.authorZhang, B.-
dc.contributor.authorWiltberger, M.-
dc.contributor.authorLyon, J.-
dc.contributor.authorStrangeway, R. J.-
dc.date.accessioned2018-02-01T01:54:13Z-
dc.date.available2018-02-01T01:54:13Z-
dc.date.issued2011-
dc.identifier.citationScience, 2011, v. 332, n. 6034, p. 1183-1186-
dc.identifier.issn0036-8075-
dc.identifier.urihttp://hdl.handle.net/10722/250972-
dc.description.abstractThe sawtooth mode of convection of Earth's magnetosphere is a 2- to 4-hour planetary-scale oscillation powered by the solar wind-magnetosphere-ionosphere (SW-M-I) interaction. Using global simulations of geospace, we have shown that ionospheric O + outflows can generate sawtooth oscillations. As the outflowing ions fill the inner magnetosphere, their pressure distends the nightside magnetic field. When the outflow fluence exceeds a threshold, magnetic field tension cannot confine the accumulating fluid; an O + -rich plasmoid is ejected, and the field dipolarizes. Below the threshold, the magnetosphere undergoes quasi-steady convection. Repetition and the sawtooth period are controlled by the strength of the SW-M-I interaction, which regulates the outflow fluence.-
dc.languageeng-
dc.relation.ispartofScience-
dc.titleMagnetosphere sawtooth oscillations induced by ionospheric outflow-
dc.typeArticle-
dc.description.natureLink_to_subscribed_fulltext-
dc.identifier.doi10.1126/science.1202869-
dc.identifier.scopuseid_2-s2.0-79957967054-
dc.identifier.volume332-
dc.identifier.issue6034-
dc.identifier.spage1183-
dc.identifier.epage1186-
dc.identifier.eissn1095-9203-
dc.identifier.isiWOS:000291205200044-

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