Particles are accelerated to very high, non-thermal energies in solar and space plasma
environments. While energy spectra of accelerated electrons often exhibit a power law, it …

We present a brief review of the contemporary understanding of and topical problems in
solar flare physics that can be clarified by methods of X-ray and gamma-ray astronomy. The …

Driven by recent RHESSI observations of confined loop-top hard X-ray sources in solar
flares, we consider stochastic acceleration of electrons in the presence of Coulomb …

Recent observations from RHESSI have revealed that the number of non-thermal electrons
in the coronal part of a flaring loop can exceed the number of electrons required to explain …

Aims. We seek to determine to what extent the problem of forward fitting visibilities measured
by the Spectrometer/Telescope Imaging X-rays (STIX) on board Solar Orbiter becomes more …

Maximum Entropy is an image reconstruction method conceived to image a sparsely
occupied field of view, therefore it is particularly effective at achieving super-resolution …

This study entails the third part of a global flare energetics project, in which Ramaty High-
Energy Solar Spectroscopic Imager (RHESSI) data of 191 M and X-class flare events from …

The interrelation of hard X-ray (HXR) emitting sources and the underlying physics of electron
acceleration and transport presents one of the major questions in high-energy solar flare …

Coronal flare emission is commonly observed to decay on timescales longer than those
predicted by impulsively driven, one-dimensional flare loop models. This discrepancy is …

Context. Regularized imaging spectroscopy was introduced for the construction of electron
flux images at different energies from count visibilities recorded by the Reuven Ramaty High …