Multiwavelength study of a CME: linking an erupting
filament to a rising coronal X-ray source
C. Goff (1), L. van Driel-Gesztelyi(1,2,3), L.K. Harra(1), S.A.
Matthews(1) and C.H. Mandrini(4)
(1) Mullard Space Science Laboratory, University College London, UK
(2) Konkoly Observatory, Hungary
(3) Observatoire de Paris, LESIA, France
(4) IAFE, Argentina
A long-duration event (LDE) linked to a slow coronal mass ejection (CME)
was observed in the vicinity of the NW solar limb on 16 April 2002. A
comprehensive multiwavelength analysis involving TRACE (195 A),
RHESSI, SOHO/EIT, CDS and LASCO observations as well as magnetic
modelling (SOHO/MDI) provided several new pieces of evidence supporting
the classical LDE/CME scenario: the event started with the eruption of a
filament, which was found to have helical mass motions when crossing the
CDS spectrograph slit situated 50" above the limb. Rising with the
filament, about 20,000 km under it, a coronal X-ray source was imaged
which we identified as a plasmoid originating from the interaction
between upward reconnection outflow and the closed magnetic structure of
the erupting filament. We also found downflows of plasma in hot, newly
reconnected flare loops. Finally, connecting the height-time profile of
the erupting filament in TRACE data to the one of the CME, we found
evidence for an exponential acceleration phase, indicating MHD instability
of the erupting structure.
Correspondence
Lidia van Driel-Gesztelyi (Lidia.vanDriel@obspm.fr), Observatoire de Paris, LESIA
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