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Summary: Solar Phys (2009) 259: 3147
DOI 10.1007/s11207-009-9427-5
STEREO SCIENCE RESULTS AT SOLAR MINIMUM
Formation, Interaction and Merger of an Active Region
and a Quiescent Filament Prior to Their Eruption
on 19 May 2007
L.A. Bone · L. van Driel-Gesztelyi · J.L. Culhane ·
G. Aulanier · P. Liewer
Received: 13 March 2009 / Accepted: 27 July 2009 / Published online: 2 October 2009
© Springer Science+Business Media B.V. 2009
Abstract We report observations of the formation of two filaments one active and one
quiescent, and their subsequent interactions prior to eruption. The active region filament ap-
peared on 17 May 2007, followed by the quiescent filament about 24 hours later. In the 26
hour interval preceding the eruption, which occurred at around 12:50 UT on 19 May 2007,
we see the two filaments attempting to merge and filament material is repeatedly heated sug-
gesting magnetic reconnection. The filament structure is observed to become increasingly
dynamic preceding the eruption with two small hard X-ray sources seen close to the active
part of the filament at around 01:38 UT on 19 May 2007 during one of the activity episodes.
The final eruption on 19 May at about 12:51 UT involves a complex CME structure, a flare
and a coronal wave. A magnetic cloud is observed near Earth by the STEREO-B and WIND
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