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- W2010168747 abstract "Nonlinear guiding center (NLGC) theory has been used to explain the asymptotic perpendicular diffusion coefficient κ⊥ of energetic charged particles in a turbulent magnetic field, which can be applied to better understand cosmic ray transport. Here we re-derive NLGC, replacing the assumption of diffusive decorrelation with random ballistic decorrelation (RBD), which yields an explicit formula for κ⊥. We note that scattering processes can cause a reversal of the guiding center motion along the field line, i.e., backtracking, leading to partial cancellation of contributions to κ⊥, especially for low-wavenumber components of the magnetic turbulence. We therefore include a heuristic backtracking correction (BC) that can be used in combination with RBD. In comparison with computer simulation results for various cases, NLGC with RBD and BC provides a substantially improved characterization of the perpendicular diffusion coefficient for a fluctuation amplitude less than or equal to the large-scale magnetic field." @default.
- W2010168747 created "2016-06-24" @default.
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- W2010168747 date "2012-02-22" @default.
- W2010168747 modified "2023-09-26" @default.
- W2010168747 title "RANDOM BALLISTIC INTERPRETATION OF NONLINEAR GUIDING CENTER THEORY" @default.
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- W2010168747 doi "https://doi.org/10.1088/2041-8205/747/2/l34" @default.
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