Statistics – Applications
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh42a..06z&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH42A-06
Statistics
Applications
7514 Energetic Particles (2114), 7859 Transport Processes, 7863 Turbulence (4490)
Scientific paper
The propagation of solar energetic particles sensitively depends on the presence of magnetic turbulence, yet our physical understanding of such propagation is not yet satisfactory. Indeed, very different transport regimes can be found depending on the relevant scales of the turbulence, on the turbulence anisotropy, and on the turbulence level. Here, the transport of energetic particles in a mean magnetic field along z and the presence of anisotropic magnetic turbulence is 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. Also, the spatial distribution of particles is clearly non Gaussian. Such regimes are characterized by a Lévy statistics, with diverging second order moments. Increasing the ratio lx/lz, nearly Gaussian diffusion is obtained, showing that the transport regime depends on the turbulence anisotropy. We also change the ratio ρ/λ (Larmor radius over turbulence correlation length), finding that anomalous regimes are obtained when ρ/λ≪ 1, while normal diffusion is obtained for ρ/λ~eq1. New anomalous regimes appear when ρ/λ > 1. Comparison with the observations and applications to the transport of energetic particles in the solar wind are discussed.
Pommois Pierre
Veltri Pierluigi
Zimbardo Gaetano
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