Physics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..108..251k&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 108, no. 2, 1987, p. 251-264.
Physics
41
Helical Flow, Magnetic Flux, Rotating Fluids, Solar Flares, Solar Prominences, Sunspots, H Alpha Line, Shear Flow
Scientific paper
A great 3B flare, whose X-ray class was X13, occurred over a delta-sunspot at 00:01 UT on April 25, 1984. Before the flare, a strong magnetic shear was found to be formed along the neutral line in the delta-sunspot with shear motions of umbrae. The shear motions of the umbrae were caused by the successive emergence of a magnetic flux rope. Before the flare, several groups of sheared H-alpha threads and filaments were found to merge into an elongated filament along the neutral line through the delta-sunspot. In the merging process the helical twists were formed in the filament by the reconnection as in Pneuman's (1983) model. At the post-maximum phase of the flare, the helically twisted filament spouted out with an untwisting rotation. Examining the morphological and dynamical features of the filament eruption, it is concluded that it has some typical features of the flare spray, and that it seems to be accelerated by the sweeping-magnetic-twist mechanism proposed by Shibata and Uchida (1986).
Hanaoka Yoichiro
Kurokawa Hiroki
Shibata Kazunari
Uchida Yutaka
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