Tracking transient events through geosynchronous orbit

G.I. Korotova, D.G. Sibeck, T. Moretto, G.D. Reeves

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Impulsive events in high-latitude dayside ground magnetograms provide evidence for one or more modes of unsteady solar wind-magnetosphere interaction. We use geosynchronous magnetic field and energetic electron observations to demonstrate that the events correspond to abrupt global variations in both the magnetospheric magnetic field strength and the energetic electron flux and that these variations are particularly marked in the dayside magnetosphere. The multiple spacecraft observations suggest that the events move both dawnward and duskward from a point of origin on the prenoon magnetopause during periods of orthospiral, duskward, and northward interplanetary magnetic field orientation. Event properties are consistent with an interpretation in terms of widespread solar wind pressure fronts striking the bow shock and magnetopause.
    Original languageEnglish
    JournalJournal of Geophysical Research-space Physics
    Volume104
    Issue numberA5
    Pages (from-to)10265-10273
    ISSN2169-9380
    Publication statusPublished - 1999

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