Recent Advances in Understanding Particle Acceleration Processes in Solar Flares

Sun: flares Sun: energetic particles FOS: Physical sciences 530 01 natural sciences 520 Physics - Plasma Physics Space Physics (physics.space-ph) Sun: acceleration Plasma Physics (physics.plasm-ph) Astrophysics - Solar and Stellar Astrophysics Physics - Space Physics 0103 physical sciences [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] [PHYS.ASTR] Physics [physics]/Astrophysics [astro-ph] Sun: X-rays Solar and Stellar Astrophysics (astro-ph.SR)
DOI: 10.1007/s11214-011-9803-y Publication Date: 2011-07-25T12:22:16Z
ABSTRACT
This is a chapter in a monograph on the physics of solar flares, inspired by RHESSI observations. The individual articles are to appear in Space Science Reviews (2011)<br/>We review basic theoretical concepts in particle acceleration, with particular emphasis on processes likely to occur in regions of magnetic reconnection. Several new developments are discussed, including detailed studies of reconnection in three-dimensional magnetic field configurations (e.g., current sheets, collapsing traps, separatrix regions) and stochastic acceleration in a turbulent environment. Fluid, test-particle, and particle-in-cell approaches are used and results compared. While these studies show considerable promise in accounting for the various observational manifestations of solar flares, they are limited by a number of factors, mostly relating to available computational power. Not the least of these issues is the need to explicitly incorporate the electrodynamic feedback of the accelerated particles themselves on the environment in which they are accelerated. A brief prognosis for future advancement is offered.<br/>
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