Abstract
It has been realized that, instead of quasi‐linear theory, nonlinear kinetic theory is needed to explain simulations of the transport of cosmic rays (suprathermal charged particles with energy E ≫ 1 keV) in MHD turbulence consisting of a dominant two‐dimensional component and a minor slab component, a popular approximate model of MHD turbulence in the quiet solar wind. A BGK‐Boltzmann transport theory approach to nonlinear diffusive cosmic ray transport in combined 2D and slab turbulence is used to clarify and extend a recent highly successful theory for coupled parallel and perpendicular diffusion, the so‐called weakly nonlinear theory.
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