On the cosmic ray cross field diffusion in the presence of oblique MHD waves

Details On the cosmic ray cross field diffusion in the presence of oblique MHD waves On the cosmic ray cross field diffusion in the presence of oblique MHD waves

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...337..558m&link_type=abstract

Astronomy and Astrophysics, v.337, p.558-564 (1998)

Astronomy and Astrophysics

Astrophysics

13

Magnetohydrodynamics, Turbulence, Waves, Ism: Cosmic Rays

Scientific paper

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 kappa_perpendicular to and the parallel diffusion coefficient kappa_ parallel for the flat and the Kolmogorov wave spectra, including the waves propagating oblique to the mean magnetic field vec {B}_0. We note a substantial difference in the cross-field diffusion efficiency between the considered turbulent fields. Much larger values of kappa_perpendicular to appear in the presence of fast-mode waves in comparison to the Alfven waves and we reproduce the expected increase of kappa_perpendicular to with the growing power of waves propagating perpendicular to vec {B}_0. We interpret these results in terms of the particle drifts in non-uniform magnetic fields.

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