Perpendicular transport of charged particles: Results for the unified nonlinear transport theory derived from the Newton–Lorentz equation |
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Authors: | A Dosch A Shalchi GP Zank |
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Institution: | 1. CSPAR, University of Alabama in Huntsville, 320 Sparkman Drive, Huntsville, AL 35805, USA;2. Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba , Canada R3T 2N2 |
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Abstract: | The perpendicular diffusion coefficient is calculated by combining a recently developed Unified Nonlinear Transport (UNLT) theory with the Newton–Lorentz equation. The total perpendicular mean free path can be described as a combination of a guiding center contribution and a microscopic contribution. It is shown that the total mean free path depends strongly on the energy range of the turbulence power spectrum and on particle energy. Further, a slab/2D composite model is used to investigate the influence of each contribution to the total mean free path for a quasi-3D turbulence model. For pure 2D turbulence the UNLT reduces to the NLGC-theory. For pure slab turbulence the guiding center contribution is subdiffusive in accordance with simulations and the theorem on reduced dimensionality. Conversely, the microscopic contribution is non-zero, which has to be interpreted as normal diffusion. |
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Keywords: | Cosmic rays Diffusion Diffusion coefficient Mean free path Magnetic fields Turbulence |
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