It is shown that the dynamic, hard X-ray spectra of the events of 1980 March 29 and June 7 observed by the Solar Maximum Mission (HXRBS) exhibit an anticorrelation of photon flux and spectral steepness. This is exhibited in terms of systematic loci followed by the event in the plane (flux I, spectral index γ). These observations are compared with a theoretical model, developed from Benz, involving injection of electrons into a thick target region from a fluctuating slab in which they are stochastically accelerated. The data are found to be in reasonable accord with the model predictions and are used to obtain constraints on plasma conditions in the acceleration site. Theoretical implications of this result are discussed, as are possible sources of deviation between the data and the theory.
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Brown et al. (1985) studied this question.