Pitch-Angle Diffusion Coefficients of Charged Particles from Computer Simulations

Details Pitch-Angle Diffusion Coefficients of Charged Particles from Computer Simulations Pitch-Angle Diffusion Coefficients of Charged Particles from Computer Simulations

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...707...61q&link_type=abstract

The Astrophysical Journal, Volume 707, Issue 1, pp. 61-66 (2009).

Astronomy and Astrophysics

Astronomy

11

Diffusion, Magnetic Fields, Turbulence

Scientific paper

Pitch-angle diffusion is a key process in the theory of charged particle scattering by turbulent magnetic plasmas. This process is usually assumed to be diffusive and can, therefore, be described by a pitch-angle diffusion or Fokker-Planck coefficient. This parameter controls the parallel spatial diffusion coefficient as well as the parallel mean free path of charged particles. In the present paper, we determine pitch-angle diffusion coefficients from numerical computer simulations. These results are then compared with results from analytical theories. Especially, we compare the simulations with quasilinear, second-order, and weakly nonlinear diffusion coefficients. Such a comparison allows the test of previous theories and will lead to an improved understanding of the mechanism of particle scattering.

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