Abstract
Analysis of the phenomenon of the shrinkage of a coronal magnetic loop during the impulsive phase of a flare makes it possible to determine both the evolution of electric current in the loop and the loop resistance. We show that the flare process is accompanied by a substantial (two orders of magnitude) increase in the loop resistance along with a slight (~20%) decrease in the electric current. As a result, the rate of energy release grows sharply. The Rayleigh–Taylor instability in the chromosphere foot-points of the loop leads to a decrease in the cross section of the current channel and to a sharp increase in the loop resistance, simultaneously triggering a flare. The physics of loop shrinkage is illustrated by the examples of August 24, 2002 and January 20, 2005 flares.
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