Abstract
The evolution of solar flare activity was followed by the method of cumulative summation curves according to observed H-alpha flares and X-ray bursts (measured on satellites) in the active region No. 5747 during one rotation when the energetic solar flares of 19 October 1989 occurred. It was found that the steep trend of increased activity sets on several tens of hours prior to the occurrence of the energetic flare, which could be used, together with other methods, for forecasts of major flares.
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