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| Titel |
Substorm observations in the early morning sector with Equator-S and Geotail |
| VerfasserIn |
R. Nakamura, G. Haerendel, W. Baumjohann, A. Vaivads, H. Kucharek, B. Klecker, E. Georgescu, J. Birn, L. M. Kistler, T. Mukai, S. Kokubun, P. Eglitis, L. A. Frank, J. B. Sigwarth |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 17, no. 12 ; Nr. 17, no. 12, S.1602-1610 |
| Datensatznummer |
250013852
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| Publikation (Nr.) |
 copernicus.org/angeo-17-1602-1999.pdf |
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| Zusammenfassung |
Data from Equator-S and Geotail are used to
study the dynamics of the plasma sheet observed during a substorm with multiple
intensifications on 25 April 1998, when both spacecraft were located in the
early morning sector (03–04 MLT) at a radial distance of 10–11 RE.
In association with the onset of a poleward expansion of the aurora and the
westward electrojet in the premidnight and midnight sector, both satellites in
the morning sector observed plasma sheet thinning and changes toward a more
tail-like field configuration. During the subsequent poleward expansion in a
wider local time sector (20–04 MLT), on the other hand, the magnetic field
configuration at both satellites changed into a more dipolar configuration and
both satellites encountered again the hot plasma sheet. High-speed plasma flows
with velocities of up to 600 km/s and lasting 2–5 min were observed in the
plasma sheet and near its boundary during this plasma sheet expansion. These
high-speed flows included significant dawn-dusk flows and had a shear structure.
They may have been produced by an induced electric field at the local
dipolarization region and/or by an enhanced pressure gradient associated with
the injection in the midnight plasma sheet.
Key words. Magnetospheric physics (magnetospheric
configuration and dynamics; plasma sheet; storms and substorms) |
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