Abstract
We have calculated the time profiles of spatially integrated hard X-ray (30-500 keV) and soft X-ray (1-8 A) emission in both thick-target electron-heated models, and bulk heated thermal models, of the impulsive phase of solar flares. For the thermal model, we find a serious difficulty: the time profiles of the 30-500 keV hard X-ray emission do not peak at the same time as those for the higher energy component (40-500 keV) of this emission, a result that manifestly disagrees with the observations. In the thick-target model, however, the hard X-ray light curves at all energies >30 keV peak at the same time, lending considerable support to this model
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