Abstract
We investigate test-particle diffusion in dynamical turbulence based on a numerical approach presented before. For the turbulence we employ the nonlinear anisotropic dynamical turbulence model which takes into account wave propagation effects as well as damping effects. We compute numerically diffusion coefficients of energetic particles along and across the mean magnetic field. We focus on turbulence and particle parameters which should be relevant for the solar system and compare our findings with different interplanetary observations. We vary different parameters such as the dissipation range spectral index, the ratio of the turbulence bendover scales, and the magnetic field strength in order to explore the relevance of the different parameters. We show that the bendover scales as well as the magnetic field ratio have a strong influence on diffusion coefficients whereas the influence of the dissipation range spectral index is weak. The best agreement with solar wind observations can be found for equal bendover scales and a magnetic field ratio of \(\delta B / B_{0} = 0.75\).
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Acknowledgements
A. Shalchi acknowledges support by the Natural Sciences and Engineering Research Council (NSERC) of Canada. Most simulations shown in this article were obtained by using the national computational facility provided by WestGrid. We are also grateful to S. Safi-Harb for providing her CFI-funded computational facilities for code tests and for some of the simulation runs presented here.
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Heusen, M., Shalchi, A. Simulations of energetic particles interacting with nonlinear anisotropic dynamical turbulence. Astrophys Space Sci 361, 308 (2016). https://doi.org/10.1007/s10509-016-2899-5
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DOI: https://doi.org/10.1007/s10509-016-2899-5