Abstract
A method for estimating the spatial period of energy release in solar flares is proposed toanalyze the present-day satellite observations of arcades of flare coronal loops. The method is based on theapplication of a Fourier analysis to the difference images of flare arcades in the far ultraviolet. The operationof the method is demonstrated with the observations of the Bastille Day flare from the TRACE spacecraftin the 171 ˚A channel. The mean spatial period of energy release in the Bastille Day flare determined bythe proposed method is 5–8 Mm, in good agreement with the scenario for the development of thermalinstability of the preflare current layer in solar flares.
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