Abstract
During the rise time of an impulsive solar burst of hard X-rays and microwaves, energy release overwhelms losses so that the characteristics of the flare energy release process are best displayed. A sample of 30 bursts was analyzed, and the rise times of the bursts were compared with their source length scales. The result, as in earlier work employing the 'thermal conduction-front' model, is that the burst length scales were linerly proportional to their rise times, and ranged from 5.4 x 10 to the 6th to 3.6 x 10 to the 9th cm. This proportionality places a new and restrictive condition upon the possible energy release processes. The new condition is especially powerful because the proportionality was formerly believed to depend on the thermal source model alone, but now is known to follow from every model in current use.
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