Dynamics of microwave sources in eruptive flares on 23 July 2016 observed by the Siberian Radioheliograph, Nobeyama Radioheliograph, and SSRT

Nataliia Meshalkina, Institute of Solar-Terrestrial Physics

Microwave emission can provide important information on processes in eruptive flares. Starting from 2016, the Siberian Radioheliograph (SRH) routinely supplies multi-frequency imaging and non-imaging data in total intensity and circular polarization. The observing frequencies of the SRH (five frequencies from 4 to 8 GHz), Siberian Solar Radio Telescope (SSRT, 5.7 GHz), and Nobeyama Radioheliograph (NoRH, 17 and 34 GHz) sample both sides of the gyrosynchrotron spectrum around the turnover frequency for most flares. We address two eruptive flares that occurred on 23 July 2016 in the same active region 12565 located near the west limb. Combining microwave observations of the two events, we follow the dynamics of microwave sources in different parts of the gyrosynchrotron spectrum and identify the structures visible in microwave images. Invoking extreme-ultraviolet and X-ray data, we pursue understanding the nature and properties of microwave sources and reconstruct the overall picture of the eruptive flares.