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| Titel |
Ps 6 disturbances: relation to substorms and the auroral oval |
| VerfasserIn |
M. Connors, G. Rostoker, G. Sofko, R. L. McPherron, M. G. Henderson |
| 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 ; 21, no. 2 ; Nr. 21, no. 2, S.493-508 |
| Datensatznummer |
250014571
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| Publikation (Nr.) |
 copernicus.org/angeo-21-493-2003.pdf |
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| Zusammenfassung |
Ps 6 disturbances and
associated omega bands are often considered to be part of the phenomenology of
the recovery phase of substorms. We note cases of the initiation of Ps 6
activity at or very near the time of onset, either of a substorm expansive
phase, a pseudobreakup, or a poleward border intensification. Thus, we claim
that Ps 6 disturbances need not be viewed primarily as phenomena of the
recovery phase. This produces both the challenge of explaining Ps 6 within a
broader context and the opportunity to use Ps 6 observations to better
understand magnetospheric phenomenology, including expansive phase onsets. We
further examine the position of the causative currents for Ps 6 and find that
they may be located at either the equatorward or poleward border of the auroral
oval, or within it. In the first case, the relationship of expansive phase
onset and time delay to Ps 6 initiation appears to be very short. In the latter
case, there is an association with poleward border intensification, but with a
measurable time delay. We present HF radar data to discuss how the electric
field at onset time favors the growth of Ps 6 current systems.
Key words. Magnetospheric physics
(Storms and substorms; Electric fields; MHD waves and instabilities) |
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