The Parallel Mean Free Path of Heliospheric Cosmic Rays in Composite Slab/Two‐dimensional Geometry. I. The Damping Model of Dynamical Turbulence

Abstract

The parallel mean free path of cosmic-ray particles in partially turbulent electromagnetic fields is calculated in the damping model of dynamical turbulence for pure two-dimensional turbulence geometry. Using the general results for the pitch-angle Fokker-Planck coefficient for pure slab geometry from Teufel & Schlickeiser, the parallel mean free path for composite slab/two-dimensional geometry is also calculated. The rigidity dependence and the absolute value of the mean free path for this general turbulence geometry are compared with observational results. We demonstrate that the composite model is able to explain observational results.