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According to the RATAN-600 observations of the Sun in the microwave range, we isolated a class of flare-productive active regions, characterized by abrupt reversals of circular polarization in frequency and time in the interval from several hours to three days. This indicates the existence of a long preparatory phase in the preflare solar radiation. Such an early registration of the preflare status opens up opportunities for developing new methods for forecasting powerful proton events on the Sun.
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