We review basic theoretical concepts in particle acceleration, with particular emphasis on
processes likely to occur in regions of magnetic reconnection. Several new developments …

Gamma-rays and neutrons are the only sources of information on energetic ions present
during solar flares and on properties of these ions when they interact in the solar …

We present RHESSI imaging of three flares (2003 October 28 and 29 and November 2) in
the 2.223 MeV neutron-capture gamma-ray line with angular resolution as high as 35'' …

We analyze all RHESSI measurements from 2002 to 2005 (29 flare events) of the 2.223 MeV
neutron-capture γ-ray line and> 0.3 MeV electron bremsstrahlung continuum emissions …

We provide evidence for particle acceleration up to∼ 5 MeV at reconnecting current sheets
in the solar wind based on both case studies and a statistical analysis of the energetic ion …

We present the results of charged particle orbit calculations in prescribed electric and
magnetic fields motivated by magnetic reconnection models. Due to the presence of a strong …

Context. Twisted coronal loops should be ubiquitous in the solar corona. Twisted magnetic
fields contain excess magnetic energy, which can be released during magnetic …

RHESSI measurements relevant to the fundamental processes of energy release and
particle acceleration in flares are summarized. RHESSI's precise measurements of hard X …

We study test particle trajectories in the vicinity of a three-dimensional (3D) magnetic null
point during spine reconnection. Particles are injected into the steady-state non-uniform …

Proton and electron acceleration in a fragmenting periodic current sheet (CS) is
investigated, based on the forced magnetic reconnection scenario. The aim is to understand …