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Hui Li   Submitted: 2007-11-27 20:53

During the JOP178 campaign in August 2006 we observed the disappearance of our target, a large quiescent filament located at S25, after an observation time of three days (August 24 to August 26). Multi-wavelength instruments were operating: THEMIS/MTR (''MulTi-Raies'') vector magnetograph, TRACE (''Transition Region and Coronal Explorer'') at 171 Å and 1600 Å and Hida Domeless Solar telescope. Counter-streaming flows (±10 km s-1) in the filament were detected more than 24 hours before its eruption. A slow rise of the global structure started during this time period with a velocity estimated to be of the order of 1 km s-1. During the hour before the eruption (August 26 around 09:00 UT) the velocity reached 5 km s-1. The filament eruption is suspected to be responsible for a slow CME observed by LASCO around 21:00 UT on August 26. No brightening in Hα or in coronal lines, no new emerging polarities in the filament channel, even with the high polarimetry sensitivity of THEMIS, were detected. We measured a relatively large decrease of the photospheric magnetic field strength of the network (from 400 G to 100 G), whose downward magnetic tension provides stability to the underlying stressed filament magnetic fields. According to some MHD models based on turbulent photospheric diffusion, this gentle decrease of magnetic strength (the tension) could act as the destabilizing mechanism which first leads to the slow filament rise and its fast eruption.

Authors: B. Schmieder, V. Bommier, Y. Kitai, T. Matsumoto, T.T. Ishii, M. Hagino, H. Li, L. Golub
Projects: None

Publication Status: Solar Physics, accepted.
Last Modified: 2007-11-28 13:14
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