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H-Alpha and Hard X-Ray Observations of a Two-Ribbon Flare Associated with a Filament Eruption | | M. D. Ding
; Q. R. Chen
; J. P. Li
; P. F. Chen
; | | Date: |
6 Aug 2003 | | Journal: | Astrophys.J. 598 (2003) 683-688 | | Subject: | astro-ph | | Abstract: | We perform a multi-wavelength study of a two-ribbon flare on 2002 September 29 and its associated filament eruption, observed simultaneously in the H-alpha line by a ground-based imaging spectrograph and in hard X-rays by RHESSI. The flare ribbons contain several H-alpha bright kernels that show different evolutional behaviors. In particular, we find two kernels that may be the footpoints of a loop. A single hard X-ray source appears to cover these two kernels and to move across the magnetic neutral line. We explain this as a result of the merging of two footpoint sources that show gradually asymmetric emission owing to an asymmetric magnetic topology of the newly reconnected loops. In one of the H-alpha kernels, we detect a continuum enhancement at the visible wavelength. By checking its spatial and temporal relationship with the hard X-ray emission, we ascribe it as being caused by electron beam precipitation. In addition, we derive the line-of-sight velocity of the filament plasma based on the Doppler shift of the filament-caused absorption in the H-alpha blue wing. The filament shows rapid acceleration during the impulsive phase. These observational features are in principal consistent with the general scenario of the canonical two-ribbon flare model. | | Source: | arXiv, astro-ph/0308085 | | Services: | Forum | Review | PDF | Favorites | |
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