Аннотация:The dynamics of electromagnetic emission with deep modulation of the
carrier frequency in a band from 0.01 to 1.5 Hz (SE type) before intense proton
flares on the Sun have been studied using the dynamic spectra obtained at Vostok
observatory. It was determined that the modulation quasi-period of the emission
carrier frequency increases on average from 30 to 60 min approximately the day
before the flare and then reduces gradually.