Solar Physics Russian Scattering of radio waves by irregularities in the coronal electron density is inevitably accompanied by occurrence of scattered signal intensity variations. According to the probability theory, an exponential law describes the distribution of scattered signal intensity. An exponential law satisfactorily fits the empirical distribution of intensity of the majority of the observed noise storms as well. The listed facts favour the hypothesis of the noise storm burst component formation as a result of scattering of radio radiation of a quasi stable dot source by coronal irregularities. refraction of radio waves,solar noise storm