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On the cosmic ray cross field diffusion in the presence of oblique MHD waves
G. Michalek and
Received 1 April 1998 / Accepted 17 June 1998
The process of particle cross-field diffusion in the presence of finite MHD amplitude wave fields is considered using the Monte Carlo particle simulations. We derive the cross-field diffusion coefficient and the parallel diffusion coefficient for the flat and the Kolmogorov wave spectra, including the waves propagating oblique to the mean magnetic field . We note a substantial difference in the cross-field diffusion efficiency between the considered turbulent fields. Much larger values of appear in the presence of fast-mode waves in comparison to the Alfvén waves and we reproduce the expected increase of with the growing power of waves propagating perpendicular to . We interpret these results in terms of the particle drifts in non-uniform magnetic fields.
Key words: magnetohydrodynamics turbulence waves ISM: cosmic rays
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Online publication: August 17, 1998