On the influence of open magnetic flux on substorm intensity: Ground- and space-based observations

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dc.contributorVirginia Techen
dc.contributor.authorClausen, Lasse B. N.en
dc.contributor.authorMilan, Stephen E.en
dc.contributor.authorBaker, Joseph B. H.en
dc.contributor.authorRuohoniemi, J. Michaelen
dc.contributor.authorGlassmeier, K. H.en
dc.contributor.authorCoxon, J. C.en
dc.contributor.authorAnderson, B. J.en
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessed2014-01-31en
dc.date.accessioned2014-02-05T14:20:23Zen
dc.date.available2014-02-05T14:20:23Zen
dc.date.issued2003-06-01en
dc.description.abstractUsing the location of maximum region 1 current determined by the Active Magnetosphere and Planetary Electrodynamics Response Experiment as a proxy for the open/closed field line boundary, we monitor the evolution of the amount of open magnetic flux inside the magnetosphere during 772 substorms. We then divide all substorms into three classes, depending on the amount of open flux at expansion phase onset. Studying the temporal variations during the substorms of each class for a number of related geophysical parameters, we find that substorms occurring while the amount of open flux is large are generally more intense. By intense we mean that the auroral electrojet, region 1 current, auroral brightness, tail dipolarization and flow speed, ground magnetic signatures, Pi2 wave power, as well as the intensity and extent of the substorm current wedge (SCW) are all larger than during substorms that occur on a contracted polar cap. The SCW manifests itself as an intensification of the nightside R1 and R2 current system after onset. Our analysis shows that to dispose of large amounts of accumulated open magnetic flux, large substorms are triggered in the terrestrial magnetosphere.en
dc.description.sponsorshipNational Science FoundationATM-0924919, AGS-0946900en
dc.description.sponsorshipDeutsches Zentrum fuer Luft- und Raumfahrt 50OC1102, 50OC1001en
dc.description.sponsorshipScience and Technology Facilities Council (STFC), UK ST/H002480/1en
dc.description.sponsorshipSTFC studentshipen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationClausen, L. B. N., S. E. Milan, J. B. H. Baker, J. M. Ruohoniemi, K.-H. Glassmeier, J. C. Coxon, and B. J. Anderson (2013), On the influence of open magnetic flux on substorm intensity: ground- and space-based observations, J. Geophys. Res. Space Physics, 118, 2958-2969, doi:10.1002/jgra.50308.en
dc.identifier.doihttps://doi.org/10.1002/jgra.50308en
dc.identifier.issn2169-9380en
dc.identifier.issn2169-9402en
dc.identifier.urihttp://hdl.handle.net/10919/25310en
dc.identifier.urlhttp://onlinelibrary.wiley.com/doi/10.1002/jgra.50308/pdfen
dc.language.isoenen
dc.publisherAmerican Geophysical Unionen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectSubstormsen
dc.subjectSubstorm current wedgeen
dc.subjectField-aligned currentsen
dc.subjectAmperesen
dc.subjectOpenen
dc.subjectClosed field line boundaryen
dc.subjectField-aligned currentsen
dc.subjectMagnetospheric substormsen
dc.subjectBirkeland currentsen
dc.subjectSystemsen
dc.subjectOnseten
dc.subjectMagnetometersen
dc.subjectGrowthen
dc.titleOn the influence of open magnetic flux on substorm intensity: Ground- and space-based observationsen
dc.title.serialJournal of Geophysical Research-Space Physicsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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