Particle acceleration by slow modes in strong compressible MHD turbulence, with application to solar flares

Details Particle acceleration by slow modes in strong compressible MHD turbulence, with application to solar flares Particle acceleration by slow modes in strong compressible MHD turbulence, with application to solar flares

2003-11-13

arxiv.org/abs/astro-ph/0311331v1

Astrophys.J. 599 (2003) 1426-1433

Astronomy and Astrophysics

Astrophysics

19 pages, 3 figures, accepted for publication in ApJ

Scientific paper

10.1086/379317

Energetic particles that undergo strong pitch-angle scattering and diffuse through a plasma containing strong compressible MHD turbulence undergo diffusion in momentum space with diffusion coefficient Dp. In this paper, the contribution of slow modes to Dp is calculated assuming the rms turbulent velocity is of order the Alfven speed. The energy spectrum of accelerated particles is derived assuming slow modes make the dominant contribution to Dp, taking into account Coulomb losses and particle escape from the acceleration region with an energy-independent escape time. The results are applied to solar flares.

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