Koval A. Decametre radiation of the quiet-Sun corona

The research object: the radio emission of the quiet-Sun corona in the decameter wavelengths range in period of weak solar activity. The purpose of the thesis is to study basic parameters of continuum radio emission of the quiet Sun in the frequency range 16.5-33.0 MHz using heliographic modes of the UTR-2 radio telescope. Research methods: the experimental method of radioastronomical observations by the UTR-2 telescope in multi-beam tracking mode, the method of fast discrete Fourier transform, statistical methods of data processing. New theoretical and practical results: for the first time in a wide continuous frequency band at decameter wavelengths, from 16.5 to 33.0 MHz, the radio observations of the quiet Sun have been fulfilled; the angular sizes of the solar corona, as well as frequency and power parameters of solar continuum radiation have been determined; first, a comparative analysis of the characteristics of the quiet-Sun radiation has been carried out according to results of systematic multi-day observations in 2010-2012; the expanded and revised spectrum of the radio emission of the quiet Sun has been determined at decameter wavelengths; first it has been obtained the two-dimensional multi-frequency radio maps of the quiet-Sun brightness distribution at decameter wavelengths; a new method has been developed and applied for the reconstruction of two-dimensional images obtained with radio heliograph, which is to create a recovery algorithm of heliograms taking into account the features of UTR-2 antenna pattern. Application field: astrophysics, radioastronomy.