Large-amplitude electric fields in the inner magnetosphere: Van Allen Probes observations of subauroral polarization streams

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dc.citation.firstpage5294en_US
dc.citation.issueNumber6en_US
dc.citation.journalTitleJournal of Geophysical Research: Space Physicsen_US
dc.citation.lastpage5306en_US
dc.citation.volumeNumber121en_US
dc.contributor.authorCaliff, S.en_US
dc.contributor.authorLi, X.en_US
dc.contributor.authorWolf, R.A.en_US
dc.contributor.authorZhao, H.en_US
dc.contributor.authorJaynes, A.N.en_US
dc.contributor.authorWilder, F.D.en_US
dc.contributor.authorMalaspina, D.M.en_US
dc.contributor.authorRedmon, R.en_US
dc.date.accessioned2017-08-21T14:34:16Zen_US
dc.date.available2017-08-21T14:34:16Zen_US
dc.date.issued2016en_US
dc.description.abstractThe subauroral polarization stream (SAPS) is an important magnetosphere-ionosphere (MI) coupling phenomenon that impacts a range of particle populations in the inner magnetosphere. SAPS studies often emphasize ionospheric signatures of fast westward flows, but the equatorial magnetosphere is also affected through strong radial electric fields in the dusk sector. This study focuses on a period of steady southward interplanetary magnetic field (IMF) during the 29 June 2013 geomagnetic storm where the Van Allen Probes observe a region of intense electric fields near the plasmapause over multiple consecutive outbound duskside passes. We show that the large-amplitude electric fields near the equatorial plane are consistent with SAPS by investigating the relationship between plasma sheet ion and electron boundaries, associated field-aligned currents, and the spatial location of the electric fields. By incorporating high-inclination DMSP data we demonstrate the spatial and temporal variability of the SAPS region, and we suggest that discrete, earthward propagating injections are driving the observed strong electric fields at low L shells in the equatorial magnetosphere. We also show the relationship between SAPS and plasmasphere erosion, as well as a possible correlation with flux enhancements for 100s keV electrons.en_US
dc.identifier.citationCaliff, S., Li, X., Wolf, R.A., et al.. "Large-amplitude electric fields in the inner magnetosphere: Van Allen Probes observations of subauroral polarization streams." <i>Journal of Geophysical Research: Space Physics,</i> 121, no. 6 (2016) Wiley: 5294-5306. https://doi.org/10.1002/2015JA022252.en_US
dc.identifier.digitalLarge-amplitude_electric_fieldsen_US
dc.identifier.doihttps://doi.org/10.1002/2015JA022252en_US
dc.identifier.urihttps://hdl.handle.net/1911/97376en_US
dc.language.isoengen_US
dc.publisherWileyen_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.titleLarge-amplitude electric fields in the inner magnetosphere: Van Allen Probes observations of subauroral polarization streamsen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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