[en] An analysis is made of the phenomenon observed on the 21st of May, 1973 and registered at IZMIRAN (Institute for Earth Magnetism, Ionosphere and Radiowave Propagation, USSR Academy of Sciences) with the aid of 45-90 and 140-180 MHz spectrographs and 74 and 204 MHz polarimeters. Against the background of a continuous storm there were observed for a few hours pulsations of radioemission with typical time of 10-20 s. Pulsations drift from lower frequencies to higher ones at a rate of 12-25 MHz/s. The relative amplitude of pulsations is above 300% at 74 MHz, and it decreases gradually with the frequency increasing to 90% at 204 MHz. The circular polarization of the continuous storm background, which corresponds to a conventional wave, is equal to 65-75%. The increase in flux density at 74 MHz involves the decrease in polarization degree to 50%, and the weakening of the continuum is accompanied by the increase in polarization degree up to 100%. The principal features of this phenomenon are explained within the framework of a model where the pulsations are attributed to the radioemission of electron fluxes which are ejected quasiperiodically from the neutral current layer having a helmet-like configuration of the coronal magnetic field. The electron fluexes propagate toward the solar surface with a velocity of (5-10)x10⁹ cm/s