Manifestation of microflares in modulation of the microwave radiation of the coronal magnetic loops

We reveal a modulation the frequency of which varies quasi-periodically with a variation period of about 150 s when analyzing the low-frequency modulation of the intensity of the solar microwave radiation. It is shown that this modulation can be a manifestation of the microflares occurring in the coronal magnetic loop. The interaction of 5-min photospheric oscillations with currentcarrying loops results in modulation of the electric current in the loop and, as a result, generation of the inductive electric field. This leads to the emergence of a group of runaway electrons and their acceleration by the electric field. The most favorable conditions for the acceleration appear near the loop top, where the Dreicer field is minimum. When the electrons accelerated in the region near the top of the loop reach its footpoints, a microflare is observed. The radiation loss of the loop and the energy which is released in the loop as a result of the microflares are compared It is shown that for some loop parameters, the radiation loss can be compensated completely and the heating can exceed the radiation loss.