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Numerical study of Cosmic Ray Diffusion in MHD turbulence

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arxiv 1002.2646 v1 pith:KVAEA7FF submitted 2010-02-15 astro-ph.GA

classification astro-ph.GA
keywords particlediffusionturbulencecosmicfieldsmagneticnumericalproduced
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We study diffusion of Cosmic Rays (CRs) in turbulent magnetic fields using test particle simulations. Electromagnetic fields are produced in direct numerical MHD simulations of turbulence and used as an input for particle tracing, particle feedback on turbulence being ignored. Statistical transport coefficients from the test particle runs are compared with earlier analytical predictions. We find qualitative correspondence between them in various aspects of CR diffusion. In the incompressible case, that we consider in this paper, the dominant scattering mechanism occurs to be the non-resonant mirror interactions with the slow-mode perturbations. Perpendicular transport roughly agrees with being produced by magnetic field wandering.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Sub-sonic compressible magnetohydrodynamic turbulence I. Alfv\'enic and fast-magnetosonic injection, amplitude dependence, and compressibility effects

    physics.plasm-ph 2026-08 conditional novelty 6.0 of 10

    In decaying sub-sonic MHD turbulence simulations, the amplitude and plasma beta, not the injection wave type, set the turbulent density fluctuation level, while curvature and mirror statistics change dramatically with...

  2. Time-dependent cosmic-ray escape from wind bubbles: hard spectra formation

    astro-ph.HE 2026-06 unverdicted novelty 5.0 of 10

    Numerical modeling of time-dependent cosmic-ray advection and diffusion in spherically symmetric wind bubbles shows escaping spectra harder than E^{-2} during the wind-driven phase, with low-energy suppression dependi...

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