The shock waves and the magnetic field in the corona above the active region on February 17–28, 1969

Abstract

In this paper the situation above the large active region which passed across the solar disc between February 17 and 28, 1969 is considered. Five dynamical spectra of type II radio bursts registered by CSIRO and by Weissenau Observatory were used. After the elaboration of dynamical spectra, the parameters of shock waves and the values of magnetic field in corona were determined. The magnetic field was obtained using two methods. In the first method the connection between the velocity of shock front and the velocity of the Alfven waves was used. In the second method the dependence of the frequency split upon the value of the magnetic field was applied.