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Recent Advances in Understanding Particle Acceleration Processes in Solar Flares |
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| Authors: | V V Zharkova K Arzner A O Benz P Browning C Dauphin A G Emslie L Fletcher E P Kontar G Mann M Onofri V Petrosian R Turkmani N Vilmer L Vlahos |
| Institution: | 1. Department of Mathematics, University of Bradford, Bradford, UK 2. ETH, Zurich, Switzerland 3. Physics Department, University of Manchester, Manchester, UK 4. LESIA-Observatoire de Paris, CNRS, UPMC Univ Paris 06, Univ. Paris-Diderot, Paris, France 5. Department of Physics and Astronomy, Western Kentucky University, Bowling Green, KY, 42101, USA 6. Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UK 7. Astrophysikalischen Institut, Potsdam, Germany 8. Dept. of Physics, University of Thessaloniki, Thessaloniki, 54124, Greece 9. Center for Astrophysics, Stanford University, Palo Alto, USA 10. Imperial College, London, UK |
| Abstract: | 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. |
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