John C. Brown

TL;DR: RHESSI as discussed by the authors is a Principal Investigator (PI) mission, where the PI is responsible for all aspects of the mission except the launch vehicle, and is designed to investigate particle acceleration and energy release in solar flares, through imaging and spectroscopy of hard X-ray/gamma-ray continua emitted by energetic electrons, and of gamma-ray lines produced by energetic ions.

TL;DR: In this article, the Bethe-Heitler formula for the electronproton bremsstrahlung cross-section over the 20-100 keV range of energies admits of a general analytic solution for electron spectrum in terms of the X-ray spectrum, in a form convenient for computation.

TL;DR: The Utrecht solar hard X-ray spectrometer S-100 on board the ESRO TD-1A satellite covers the energy range above 25 keV with 12 logarithmically spaced channels.

TL;DR: In this article, the directivity and polarisation of solar hard X-ray bursts are discussed in terms of two bremsstrahlung source models, which involve continuous and impulsive injection of electrons respectively.

TL;DR: The theoretical and observational evidence for and against an impulsively heated thermal bremsstrahlung source of solar hard X-ray bursts is briefly reviewed in this article, where it is shown that in a collision-dominated plasma of any reasonable density the collisional relaxation time would be much longer, and the conductive cooling time much shorter, than typical burst durations.