Parallel Diffusion of Charged Particles in Strong Two-dimensional Turbulence

Details Parallel Diffusion of Charged Particles in Strong Two-dimensional Turbulence Parallel Diffusion of Charged Particles in Strong Two-dimensional Turbulence

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...640l.103q&link_type=abstract

The Astrophysical Journal, Volume 640, Issue 1, pp. L103-L106.

Astronomy and Astrophysics

Astronomy

26

Diffusion, Scattering, Turbulence

Scientific paper

Computation of charged-particle orbits shows that large-amplitude two-dimensional magnetic turbulence supports diffusive transport of charged test particles parallel to the mean magnetic field. This stands in sharp contrast to scattering in the quasi-linear approximation, for which we show quite generally that the two-dimensional scattering rate vanishes. We also demonstrate that at large amplitude, two-dimensional turbulence makes important contributions to the parallel mean free path of particles in mixtures of two-dimensional and slab turbulence. This raises important questions regarding cosmic-ray mean free paths that had been thought to be settled based on quasi-linear theory.

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