Jena 2013 – scientific programme

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EP: Fachverband Extraterrestrische Physik

EP 1: Astrophysik

EP 1.4: Talk

Monday, February 25, 2013, 15:00–15:15, HS 9

Anisotropic diffusion of Galactic cosmic ray protons and their steady-state azimuthal distribution — •Frederic Effenberger, Horst Fichtner, Klaus Scherer, and Ingo Büsching — Theoretische Physik IV, Ruhr-Universität Bochum

Galactic transport models for cosmic rays involve the diffusive motion of these particles in the interstellar medium. Owing to the large-scale structured Galactic magnetic field, this diffusion is anisotropic with respect to the local field direction. We included this transport effect along with continuous loss processes in a quantitative model of Galactic propagation for cosmic ray protons that is based on stochastic differential equations. We calculated energy spectra at different positions along the Sun's Galactic orbit and compared them to the isotropic diffusion case. The results show that a larger amplitude of variation and different spectral shapes are obtained in the introduced anisotropic diffusion scenario, which in turn emphasizes the need for accurate Galactic magnetic field models.