The birth of giant post-flare arches

Details The birth of giant post-flare arches The birth of giant post-flare arches

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..138..189p&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 138, March 1992, p. 189-199. Research supported by ASI.

Physics

7

Magnetic Field Reconnection, Solar Corona, Solar Flares, Arches, Energy Bands, Solar Magnetic Field, Solar Rotation

Scientific paper

Using short accumulation times, it was possible to detect in HXIS images of the initial growth of the giant post-flare arch of 6 November, 1980 at 14:44 UT and part of the initial growth of the giant arch of 7 November, 1980 at 04:30 UT. These observations are relevant to the problem of the origin of giant arches: the fact that the arch of 6 November was imaged more than 1/2 h before the first flare loops had been recorded in the associated flare, proves that giant arches cannot be interpreted as upper products of the reconnection process that creates the growing systems of flare loops (as the original interpretation by Svestka et al. (1982) suggested). However, the alternative hypothesis by Poletto and Kopp (1988) that these structures originate through a reconnection process in a peripheral, large-scale configuration also meets difficulties: after the initial rise, the maximum brightness in both arches seems to descend, until a much slower rise was resumed about 2 h later.

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