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| Titel |
Multispacecraft observations of a prominence eruption |
| VerfasserIn |
A. Bemporad, G. Zanna, V. Andretta, G. Poletto, M. Magrí |
| 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. 10 ; Nr. 27, no. 10 (2009-10-09), S.3841-3851 |
| Datensatznummer |
250016673
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| Publikation (Nr.) |
 copernicus.org/angeo-27-3841-2009.pdf |
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| Zusammenfassung |
| On 9 May 2007 a prominence eruption occurred at the West limb. Remarkably,
the event was observed by the STEREO/EUVI telescopes and by the HINODE/EIS
and SOHO/UVCS spectrometers. We present results from all these instruments.
High-cadence (~37 s) data from STEREO/EUVI A and B in the He II
λ304 line were used to study the 3-D shape and expansion of the
prominence. The high spatial resolution EUVI images (~1.5"/pixel) have
been used to infer via triangulation the 3-D shape and orientation of the
prominence 12 min after the eruption onset. At this time the prominence
has mainly the shape of a "hook" highly inclined southward, has an average
thickness of 0.068 R⊙, a length of 0.43 R⊙ and lies, in first
approximation, on a plane. Hence, the prominence is mainly a 2-D structure
and there is no evidence for a twisted flux rope configuration. HINODE/EIS
was scanning with the 2" slit the region where the filament erupted. The EIS
spectra show during the eruption remarkable non-thermal broadening (up to
~100 km s−1) in the region crossed by the filament in spectral
lines emitted at different temperatures, possibly with differences among
lines from higher Fe ionization stages. The CME was also observed by the
SOHO/UVCS instrument: the spectrograph slit was centered at 1.7 R⊙, at
a latitude of 5° SW and recorded a sudden increase in the O VI
λλ1032–1037 and Si XII λ520 spectral line
intensities, representative of the CME front transit. |
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