Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...639l..91z&link_type=abstract
The Astrophysical Journal, Volume 639, Issue 2, pp. L91-L94.
Astronomy and Astrophysics
Astronomy
40
Diffusion, Plasmas, Sun: Solar Wind, Turbulence
Scientific paper
The transport of energetic particles in a mean magnetic field and the presence of anisotropic magnetic turbulence are studied numerically, for parameter values relevant to the solar wind. A numerical realization of magnetic turbulence is set up in which we can vary the type of anisotropy by changing the correlation lengths lx, ly, lz. We find that for lx, ly>>lz, transport can be non-Gaussian, with superdiffusion along the average magnetic field and subdiffusion perpendicular to it. Decreasing the lx/lz ratio down to <~0.3, Gaussian diffusion is obtained, showing that the transport regime depends on the turbulence anisotropy. Implications for energetic particle propagation in the solar wind and for diffusive shock acceleration are discussed.
Pommois Pierre
Veltri Pierluigi
Zimbardo Gaetano
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