Transport of Cosmic-rays in the Inner Heliosphere in the Presence of Composite Two-dimensional and Slab Turbulence

Details Transport of Cosmic-rays in the Inner Heliosphere in the Presence of Composite Two-dimensional and Slab Turbulence Transport of Cosmic-rays in the Inner Heliosphere in the Presence of Composite Two-dimensional and Slab Turbulence

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh43c1962a&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH43C-1962

Physics

Plasma Physics

[7807] Space Plasma Physics / Charged Particle Motion And Acceleration, [7833] Space Plasma Physics / Mathematical And Numerical Techniques, [7859] Space Plasma Physics / Transport Processes, [7863] Space Plasma Physics / Turbulence

Scientific paper

We study numerically the propagation of cosmic rays in the inner heliosphere and estimate their transport coefficients in static, low-frequency solar wind turbulence. We examine three models of turbulence: isotropic, slab, and composite two-dimensional plus slab turbulence. The strength of the magnetic field turbulence is varied extensively from weak to strong. The transport coefficients parallel and perpendicular to the background magnetic field are calculated using a newly developed parallel test-particle code (RTPCRT) and are compared to results from existing theories. It is shown, for instance, that for composite turbulence, both parallel and perpendicular cosmic-ray motion are initially superdiffusive for a brief period (less than a 100 gyroperiods). Afterwards, the cross-field motion of cosmic rays remains weakly subdiffusive for an extended period of time. A diffusive state is only reached at later times when the assumption of static turbulence may no longer be applicable. Parallel cosmic-ray motion, on the other hand, quickly reaches a diffusive state.

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