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Emerging flux as a driver for homologous flares
S.A. Matthews and
Received 15 November 1999 / Accepted 16 June 2000
We present multi-wavelength observations of 2 M-class solar flares observed by SoHO and Yohkoh, which appear to be homologous. By examination of the flare loop morphology and footpoints we propose a schematic reconnection scenario of a two loop interaction in a quadrupolar magnetic configuration, for both flares (Machado 1983; Mandrini 1991). After the first flare, the combination of chance emergence of new flux at an opportune location and a subsequent flare, of the type described by Heyvaerts et al. (1977), form a new quadrupolar configuration in which the second flare occurred. Therefore though the two M-class flares are homologous by definition, they appear to conform to a scenario in which the preflare conditions are reformed after the first flare by emerging flux, rather than models which involve the continual shearing of a single magnetic structure.
Key words: Sun: flares
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Online publication: August 23, 2000