Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-10-11
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
This is a chapter in a monograph on the physics of solar flares, inspired by RHESSI observations. The individual articles are
Scientific paper
10.1007/s11214-011-9803-y
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.
Arzner Karpar
Benz Arnold O.
Browning Philippa
Dauphin Cyril
Emslie Gordon A.
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