A Statistical Analysis of Parameters of Type III Radio Bursts According to Solar Spectropolarimeter of Meter Range (SSMD) Data

Abstract

In the paper, we present an analysis of the parameters of type III radio bursts registered in the range of 50–500 MHz by the Solar Spectropolarimeter of Meter Range (SSMD) of the radio astrophysical observatory of the Institute of Solar-Terrestrial Physics, Siberian Branch, Russian Academy of Sciences during the period of solar activity minimum from 2016 to 2019. In the study, an original method for identifying type III radio bursts has been developed and used with allowance for the features of the data related to the time and spectral resolution of the device. Most of the studied events are associated with B-class flares according to the GOES classification and lower. However, the distribution of events according to the velocities of the electrons generated the radio bursts emission does not differ from the standard distribution, including for powerful flares. A general tendency for an increase in the duration of a radio burst with a decrease in the energy of the electrons that generated it has been revealed. The electron energy band width is about one order of magnitude. The events of 2017 associated with powerful flares are at the upper limit of the energies of this band.