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| Titel |
High latitude magnetospheric topology and magnetospheric substorm |
| VerfasserIn |
E. E. Antonova, I. P. Kirpichev, I. L. Ovchinnikov, K. G. Orlova, M. V. Stepanova |
| 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 ; 27, no. 10 ; Nr. 27, no. 10 (2009-10-28), S.4069-4073 |
| Datensatznummer |
250016692
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| Publikation (Nr.) |
 copernicus.org/angeo-27-4069-2009.pdf |
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| Zusammenfassung |
| This study is focused on the problem of the localization of substorm
expansion onset. In this context, the high latitude topology of transverse
magnetospheric currents has been analyzed. This study has included the
radial distribution of plasma pressure near noon, obtained using the
THEMIS-B satellite data, the daytime compression of magnetic field lines and
the existence of magnetic field minima far from the equatorial plane, given
by all geomagnetic field models. As a result, the dayside integral
transverse currents at the geocentric distances 7–10 RE has been
estimated. It is suggested, that nightside transverse currents at geocentric
distances ~7–10 RE are closed inside the magnetosphere and with
dayside transverse currents form surrounding the Earth current system (cut
ring current or CRC) which topologically is the high latitude continuation
of ordinary ring current. A possibility of localization of substorm
expansion onset at the nighside CRC region is analyzed using the
experimental evidences that the onset is localized at geocentric distances
<10 RE. |
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