Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...326..793m&link_type=abstract
Astronomy and Astrophysics, v.326, p.793-800
Astronomy and Astrophysics
Astrophysics
9
Cosmic Rays, Mhd-Turbulence, Acceleration Of Particles, Diffusion
Scientific paper
The process of particle cross-field diffusion in high amplitude Alfvenic turbulence is considered using the method of the Monte Carlo particle simulations. We derive the cross-field diffusion coefficient κperp_ and the parallel diffusion coefficient κ_//_ in the presence of different 1-D, 2-D and 3-D turbulent wave field models and discuss the κperp_,κ_//_ and κperp_ κ_||_ variations with the wave amplitude. κperp_ is compared also to the respective derived values of the magnetic field diffusion coefficient. We note substantial differences in the cross-field diffusion efficiency at the same perturbation amplitude, depending on the detailed form of the turbulent field considered. Vanishing of κperp_ at 1-D and 2-D turbulent fields is confirmed. For some types of the turbulent magnetic field an initial regime of sub-diffusive transport appears in the simulations. The derived values of κ_||_ are weakly dependent on the wave form and scale as the inverse of the squared perturbation amplitude up to our highest non-linear amplitudes.
Michalek Gregory
Ostrowski Marcin
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