Letter to the Editor
Extended nonlinear guiding center theory of perpendicular diffusion
Institut für Theoretische Physik, Lehrstuhl IV: Weltraum- und Astrophysik, Ruhr-Universität Bochum, 44780 Bochum, Germany e-mail: email@example.com
Accepted: 21 May 2006
Recently the nonlinear guiding center theory of cosmic ray perpendicular diffusion was proposed. In this paper it is demonstrated that at least the slab contribution to the perpendicular mean free path is calculated incorrectly within this nonlinear approach. An extended theory which includes an improved treatment of the slab contribution is presented in this paper. Contrary to the original theory, the extended nonlinear guiding center theory shows agreement with numerical simulations for slab and non-slab models.
Key words: cosmic rays / turbulence / diffusion
© ESO, 2006