# Münster 2017 – wissenschaftliches Programm

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# T: Fachverband Teilchenphysik

## T 109: Kosmische Strahlung 7

### T 109.8: Vortrag

### Donnerstag, 30. März 2017, 18:35–18:50, H 3

**Galactic extension of CRPropa3** — •Lukas Merten and Julia Tjus — Ruhr Astroparticle and Plasma Physics Center (RAPP Center), Ruhr-Universität Bochum, Institut für Theoretische Physik IV/ Plasma-Astroteilchenphysik, Germany

The propagation of charged cosmic rays through the Galactic environment ifluences all aspects of the observation at Earth. Energy spectrum, composition and anisotropy are changed due to deflections in magnetic fields and nteractions with the interstellar medium. Today the transport is simulated with different simulation methods either based on the solution of a transport equation (multi-particle picture) or a solution of an equation of motion (single-particle picture).

We present a method to solve the transport equation using stochastic differential equations. This is possible since Ito's Lemma shows that a parabolic partial differential equation (like the Parker transport equation) is equivalent to a corresponsding set of stochastic differential eqautions. This technique is used e.g. in heliospheric transport problems.

We developed a new module for the publicly available CRPropa3 software which performs the propagation of pseudo particles which trace the phase space. The code is able to handle anisotropic diffusion tensors in realistic magnetic background fields as e.g. the regular component of the JF12 field. The validation of the code and first examples are shown.