Productivity of X-ray Flares in Sunspot Groups at Different Stages of Evolution (McIntosh) During Three Solar Cycles (1977-2007)
Productivity of X-ray flares in sunspot groups at different stages of evolution is studied. As shown, the flare productivity for all sunspot groups (McIntosh) in 1977-2007 does not correlate with Wolf number course: it increases at the activity decay and shows the inverse relationship with 11-year cycle that is, it demonstrates a cyclic behavior with maxima during the minimum phase of 11-year cycle.In soft X-ray range, 22-year modulation of flare activity productivity occurs. This result is interest in forecasting the mean flare energy in different phases of solar activity that, in turn, determines the space weather conditions.