  The Reuven Ramaty High Energy Spectroscopic Solar Imager (RHESSI) uses the
rotational modulation principle to observe temporally, spatially, and
spectrally resolved hard X ray and gamma ray images of solar flares. In order
to track the flare evolution on time scales that are commensurate with
modulation, the observed count rates must be demodulated at the expense of
spatial information. The present paper describes improvements of an earlier
demodulation algorithm, which decomposes the observed light curves into
intrinsic source variability and instrumental modulation.
