Abstract
Based on observations at the RT-7.5 radio telescope of the Bauman Moscow State Technical Universityat a wavelength of 3.2 mm (93 GHz), along with other ground-based and space instruments (Siberianradioheliograph, Solar Dynamics Observatory (SDO), Metsähovi radio observatory), the origin of millimeterradiation from a solar flare was investigated for the SOL2022-05-04T08:45 X-ray class M 5.7 flare. Ananalysis of the time profiles of radiation in the X-ray and centimeter ranges showed that the millimeter emissionsource is not associated with hot (5 × 105–107 K) coronal plasma. This is also evidenced by the estimateof the sub-THz flux of radiating hot plasma according to the AIA/SDO data, which turned out to be muchless than the observed values. Indications were obtained of the development of thermal instability in flareultraviolet loops. The relationship between the millimeter emission of the flare and the heat source in thesolar chromosphere has been substantiated.
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