CALIBRATION OF SIBERIAN RADIOHELIOGRAPH IMAGES

Abstract

We discuss the method for automatic calibration of solar radio images derived from the first stage of the multiwave Siberian Radioheliograph (SRH-48). SRH is a 48-element T-shaped radiointerferometer in the 4–8 GHz frequency range. Since the end of 2017, the number of frequencies has been increased to 32. The method is implemented in Python programming language. We give examples of calibration for SRH instrument values in brightness temperature of the quiet and active Sun at several frequencies for four eruptive events: June 19, 2017, July 25, 2016, April 24, 2017, and April 19, 2017. In conclusion, we present spectra for three events, as well as brightness temperature estimates by flux, angular size of filaments, and emission measure.

Keywords

• radioheliograph
• sun
• image calibration
• eruptive events
• spectrum