Theory of super-diffusion for the magnetopause

Details Theory of super-diffusion for the magnetopause Theory of super-diffusion for the magnetopause

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.1727t&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 14, p. 1727-1730

Physics

33

Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers, Magnetospheric Physics: Magnetotail Boundary Layers, Magnetospheric Physics: Planetary Magnetospheres, Magnetospheric Physics: Storms And Substorms

Scientific paper

The diffusivity in a plasma is enhanced over classical diffusion when the particles undergo Lévy flight interactions caused by scale-invariant turbulence. In this case classical parallel diffusion (heat flux) is modified. Perpendicular magnetized diffusion coefficients obtained assume a scaling D~kBT/B1+δ where δ<1. This scaling is closer to Bohm-scaling than conventional theories predict. The non-classical diffusion coefficients depend on time. As a consequence, the expected density profiles will not exhibit the usually assumed diffusive shapes. It is suggested that in regions of strong plasma turbulence enhanced superdiffusivity may contribute to the population of the inner LLBL.

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