Abstract
A technique for analyzing the stochastic time function by means of combined time and spectral description of this function is developed. It is shown that the modulation of radio emission in the solar atmosphere by wave processes or by inhomogeneities of a beam of excitation particles, as well as resonance oscillations of “frozen” plasma in magnetic arches of the active region, lead to duration distributions and spectra that differ from the observed characteristics of noise storms; that is, these mechanisms do not explain their origin. It was found that the quadratic distribution of the duration of noise storm bursts and its hyperbolic spectrum can be a consequence of random refraction of radio waves by inhomogeneities of turbulent coronal plasma.
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