Test particle transport in magnetic turbulence: subdiffusion and recovery of diffusion

Details Test particle transport in magnetic turbulence: subdiffusion and recovery of diffusion Test particle transport in magnetic turbulence: subdiffusion and recovery of diffusion

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh21c..02q&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SH21C-02

Statistics

Applications

7807 Charged Particle Motion And Acceleration, 7843 Numerical Simulation Studies, 7859 Transport Processes, 7863 Turbulence

Scientific paper

We present study of test particle transport in model magnetic turbulence. We calculate the perpendicular and parallel diffusion coefficients simultaneously for simulations in different physical parameter regimes and compare them with theoretical results. From our simulation we find that there is first standard perpendicular diffusion coefficient in very short time scale, but when parallel scattering sets in, it reduces the perpendicular diffusion coefficient. In nearly pure slab model turbulence perpendicular diffusion is suppressed to subdiffusion ("compound diffusion"), which agrees well with theory of Kota and Jokipii, [2000, ApJ, 531:1067]. But in composite model turbulence with significant transverse structure, true perpendicular diffusion ("second diffusion") is recovered. This regime can be measured along with the parallel diffusion coefficient simultaneously for very long time scale, vt/λ c = several hundreds, in the order of time scale for solar wind to travel several AU. So for many applications, the secondary perpendicular diffusion is more important than the first standard perpendicular diffusion coefficient. The work is supported by NASA grant NAG5-8134 (SEC Theory Program) and NSF grant ATM-0105254.

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