Construction of electron flux images in solar flares using interpolated visibilities

We report on a novel method for recovering both hard X-ray images, and also their corresponding "electron flux images" from RHESSI solar flare data. The method uses the discrete set of visibilities (spatial Fourier components) observed by RHESSI and an interpolation algorithm to generate smoothed visibilities over a wide range of spatial frequencies. These smoothed visibilities are then converted to images through standard imaging algorithms. Preliminary results show that this method is capable of recovering features in simulated images over a wider dynamic range than in possible with the discrete visibility set alone. Following the procedures in Massone et al. (2007, Ap. J., 670, 857), the resulting visibilities can be used to determine variations in the electron flux spectrum throughout the flare volume