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| Titel |
Magnetic field configuration and field-aligned acceleration of energetic ions during substorm onsets |
| VerfasserIn |
A. Korth, Z. Y. Pu |
| 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 ; 19, no. 9 ; Nr. 19, no. 9, S.1089-1094 |
| Datensatznummer |
250014318
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| Publikation (Nr.) |
 copernicus.org/angeo-19-1089-2001.pdf |
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| Zusammenfassung |
In this paper, we present
an interpretation of the observed field-aligned acceleration events measured by
GEOS-2 near the night-side synchronous orbit at substorm onsets (Chen et al.,
2000). We show that field-aligned acceleration of ions (with pitch angle
asymmetry) is closely related to strong short-lived electric fields in the Ey
direction. The acceleration is associated with either rapid dipolarization or
further stretching of local magnetic field lines. Theoretical analysis suggests
that a centrifugal mechanism is a likely candidate for the parallel
energization. Equatorward or anti-equatorward energization occurs
when the tail current sheet is thinner tailward or earthward of the spacecraft,
respectively. The magnetic field topology leading to anti-equatorward
energization corresponds to a situation where the near-Earth tail undergoes
further compression and the inner edge of the plasma sheet extends inwards as
close as the night-side geosynchronous altitudes.
Key words. Magnetospheric physics (magnetospheric
configuration and dynamics; plasma sheet; storms and sub-storms) |
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