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| Titel |
Cluster and Double Star multipoint observations of a plasma bubble |
| VerfasserIn |
A. P. Walsh, A. N. Fazakerley, A. D. Lahiff, M. Volwerk, A. Grocott, M. W. Dunlop, A. T. Y. Lui, L. M. Kistler, Mark Lester, C. Mouikis, Z. Pu, C. Shen, J. Shi, M. G. G. T. Taylor, E. Lucek, T. L. Zhang, I. Dandouras |
| 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. 2 ; Nr. 27, no. 2 (2009-02-16), S.725-743 |
| Datensatznummer |
250016409
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| Publikation (Nr.) |
 copernicus.org/angeo-27-725-2009.pdf |
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| Zusammenfassung |
| Depleted flux tubes, or plasma bubbles, are one possible explanation of
bursty bulk flows, which are transient high speed flows thought to be
responsible for a large proportion of flux transport in the magnetotail. Here
we report observations of one such plasma bubble, made by the four Cluster
spacecraft and Double Star TC-2 around 14:00 UT on 21 September 2005,
during a period of southward, but BY-dominated IMF. In particular the
first direct observations of return flows around the edges of a plasma
bubble, and the first observations of plasma bubble features within
8 RE of the Earth, consistent with MHD simulations (Birn et al.,
2004)
are presented. The implications of the presence of a strong BY in the
IMF and magnetotail on the propagation of the plasma bubble and development
of the associated current systems in the magnetotail and ionosphere are
discussed. It is suggested that a strong BY can rotate the field aligned
current systems at the edges of the plasma bubble away from its duskward and
dawnward flanks. |
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