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| Titel |
Magnetic reconnection processes induced by a CME expansion |
| VerfasserIn |
A. Bemporad, G. Poletto, F. Landini, M. Romoli |
| 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 ; 26, no. 10 ; Nr. 26, no. 10 (2008-10-15), S.3017-3024 |
| Datensatznummer |
250016249
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| Publikation (Nr.) |
 copernicus.org/angeo-26-3017-2008.pdf |
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| Zusammenfassung |
On 10–11 December 2005 a slow CME occurred in the Western
Hemisphere in between two coronal streamers. SOHO/MDI
magnetograms show a multipolar magnetic configuration
at the photosphere: a complex of active regions located at the CME source
and two bipoles at the base of the lateral
coronal streamers. White light observations reveal that
the CME expansion affects both of them and
induces the release of plasma within or close to the nearby streamers.
These transient phenomena are possibly due to magnetic reconnections
induced by the CME expansion and occurring inside the streamer current
sheet or between the CME flanks and the streamer.
These events have been observed by the SOHO/UVCS with
the spectrometer slit centered at 1.8 R⊙ over
about a full day. In this work we focus on the interaction
between the CME and the streamer: the UVCS spectral interval included
UV lines from ions at different temperatures of maximum
formation such as O VI, Si XIII
and Al Xi. These data gave us the opportunity to infer the
evolution of plasma temperature and density at
the reconnection site and adjacent regions. These are relevant
to characterize secondary reconnection processes occurring
during a CME development. |
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