A Method for Estimating the Spatial Period of Energy Release in Solar Flares

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Abstract

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

About the authors

L. S. Ledentsov

Sternberg Astronomical Institute, Moscow State University; Space Research Institute, Russian Academy of Sciences

Author for correspondence.
Email: leonid.ledentsov@gmail.com
Moscow, 119234 Russia; Moscow, 117997 Russia

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