Stochastic acceleration in impulsive solar flares

Details Stochastic acceleration in impulsive solar flares Stochastic acceleration in impulsive solar flares

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aipc..264..223m&link_type=abstract

In: Particle acceleration in cosmic plasmas; Proceedings of the Workshop, Bartol Research Inst., Newark, DE, Dec. 4-6, 1991 (A93

Physics

6

Ion Distribution, Magnetohydrodynamic Waves, Particle Acceleration, Solar Flares, Solar Protons, Stochastic Processes, Hydrogen Plasma, Landau Damping

Scientific paper

We consider ion energization by Alfven waves, and suggest that a combination of nonlinear Landau damping and gyroresonant acceleration could account for proton acceleration in impulsive solar flares. Based on simulations which include both processes in a H plasma, we find that 10 exp -5 of the ambient protons can be accelerated above 1 MeV and that these particles contain about 10 percent of the total available wave energy. From a simulation in a H-He plasma, we find a large ratio of accelerated alpha particles to protons. Furthermore, arguments based upon the nonlinear Landau damping rate indicate heavy element enhancements. These results are consistent with accelerated particle observations from impulsive flares.

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