Abstract
The X-ray emission of individual solar active regions is found from OSO-5 data to vary on three main timescales. Flare associated events typically last for times of minutes to an hour. Events lasting several hours, with several peaks in the X-ray emission, are accompanied by a simplification in the magnetic field, and often mark a turning point in the life of the region. Smooth changes over periods of several days are associated with the general development of a region. Examples of these last two variations are presented.
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