Relative contributions of large-scale and wedgelet currents in the substorm current wedge

dc.contributor.authorNishimura, Y.
dc.contributor.authorLyons, L. R
dc.contributor.authorGabrielse, C.
dc.contributor.authorWeygand, J. M
dc.contributor.authorDonovan, E. F
dc.contributor.authorAngelopoulos, V.
dc.date.accessioned2020-07-26T00:04:16Z
dc.date.available2020-07-26T00:04:16Z
dc.date.issued2020-07-20
dc.date.updated2020-07-26T00:04:15Z
dc.description.abstractAbstract We examined how much large-scale and localized upward and downward currents contribute to the substorm current wedge (SCW), and how they evolve over time, using the THEMIS all-sky imagers (ASIs) and ground magnetometers. One type of events is dominated by a single large-scale wedge, with upward currents over the surge and broad downward currents poleward-eastward of the surge. The other type of events is a composite of large-scale wedge and wedgelets associated with streamers, with each wedgelet having comparable intensity to the large-scale wedge currents. Among 17 auroral substorms with wide ASI coverage, the composite current type is more frequent than the single large-scale wedge type. The dawn–dusk size of each wedgelet is ~ 600 km in the ionosphere (~ 3.2 RE in the magnetotail, comparable to the flow channel size). We suggest that substorms have more than one type of SCW, and the composite current type is more frequent.
dc.identifier.citationEarth, Planets and Space. 2020 Jul 20;72(1):106
dc.identifier.doihttps://doi.org/10.1186/s40623-020-01234-x
dc.identifier.urihttp://hdl.handle.net/1880/112336
dc.identifier.urihttps://doi.org/10.11575/PRISM/44169
dc.language.rfc3066en
dc.rights.holderThe Author(s)
dc.titleRelative contributions of large-scale and wedgelet currents in the substorm current wedge
dc.typeJournal Article
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