V.M. Bogod
St.-Petersburg Branch of the Special Astrophysical Observatory,
Russian Academy of Sciences, St.-Petersburg 196140, Russia
Multiwave spectral-polarization observations of flare-productive active regions, allow recording the long time variations of their polarization emission flux on early preflare stage. The multichannel microwave observations of several active regions with flares and CME generations are presented. It also shown, that the sharp changes of AR polarization emission flux may be connected with the loss of magnetic flux erupted from the active region.