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| Titel |
Local influence of magnetosheath plasma beta fluctuations on magnetopause reconnection |
| VerfasserIn |
T. V. Laitinen, Y. V. Khotyaintsev, M. André, A. Vaivads, H. Rème |
| 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 ; 28, no. 5 ; Nr. 28, no. 5 (2010-05-05), S.1053-1063 |
| Datensatznummer |
250016826
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| Publikation (Nr.) |
 copernicus.org/angeo-28-1053-2010.pdf |
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| Zusammenfassung |
| We present observations from two subsolar Cluster magnetopause crossings
under southward interplanetary magnetic field and strong mirror mode
fluctuations in the magnetosheath. In both events the reconnection outflow
jets show strong variations on the timescale of one minute. We show that at
least some of the recorded variations are truly temporal, not spatial. On the
same timescale, mirror mode fluctuations appear as strong magnetic
fluctuations in the magnetosheath next to the magnetopause. This suggests
that mirror modes can cause the variations either through modulation of
continuous reconnection or through triggering of bursty reconnection. Using a
theoretical scaling law for asymmetric reconnection we show that modulation
of reconnection at a single x-line can explain the observations of the first
event. The second event cannot be explained by a single modulated x-line:
there the evidence points to patchy and bursty reconnection. |
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