Spectral-temporal peculiarities of microwave radiation preceding geoeffective coronal mass ejections

Data on complex of wave and spectral phenomena in the sporadic microwave radiation are presented. These phenomena are associated with formation and initial propagation of coronal mass ejections (CME) in the Sun's atmosphere. Their specific time interval is from 2 to 3 days, preceding the event, before the CMEs are registered by coronagraphs.