Abstract
We consider the thermal stability of three piecewise homogeneous models of the preflare current layer: a neutral currentlayer, a non-neutral current layer, and a current layer with oblique fragmentation. Solution to the problem allows theformation of an instability of thermal nature. The instability results in fragmentation of the current layer with a spatialperiod of 1 − 10 Mm along the current direction in a wide range of coronal plasma parameters. The result can explain theobserved spatial periods of energy release in solar flares.
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