OBSERVATION OF THE SPECTRA OF SVC SOURCES MADE IN CHINA ON THE SOLAR ECLIPSE IN THREE SOLAR CYCLES (19, 20, 21)

Ⅰ. INTRODUCTION The observation of the spectra of the SVC sources is very important in the theory of the slowly varying component (SVC) and for the prediction of solar-terrestrial environment. In order to increase the spatial resolution, solar radio astronomers made used of solar eclipses to observe the SVC sources over a wide range of frequencies to ob-