Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ptep.proc..264m&link_type=abstract
Plasma Turbulence and Energetic Particles in Astrophysics, Proceedings of the International Conference, Cracow (Poland), 5-10 Se
Astronomy and Astrophysics
Astrophysics
Scientific paper
The process of particle cross-field diffusion in high amplitude Alfvénic turbulence is considered using the method of Monte Carlo particle simulations. We derive the cross-field diffusion coefficient κperp in the presence of different 1-D, 2-D and 3-D turbulent wave field models with the flat and Kolmogorov wave spectra, including the wave propagating obliquely to the mean magnetic field Bo. 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. For some types of the turbulent magnetic field an initial regime of sub-diffusive transport appears in the simulations. Much larger values of κperp occur in the presence of fast-mode waves in comparison to the Alfvén waves and we reproduce the expected increase of κperp with the growing power of waves propagating perpendicular to Bo. We interpret these results in terms of particle drifts in non-uniform magnetic field.
Michałek Grzegorz
Ostrowski Michał
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