Galactic cosmic ray propagation models using Picard

11th International Conference on Numerical Modeling of Space Plasma Flows

Kissmann, Ralf^1

Leopold Franzens Universität Innsbruck, Austria^1

关键词: Cosmic ray sources;    Current transitions;    Efficient computation;    Galactic cosmic rays;    Numerical approaches;    Three-dimensional model;    Transport equation;    Very high resolution;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/837/1/012003/pdf
DOI  :  10.1088/1742-6596/837/1/012003

来源: IOP

【 摘 要 】

I will give an overview on the numerical approach for the solution of the Galactic cosmic-ray propagation problem used within the recently introduced code Picard. The code solves the transport equation for each cosmic-ray species resulting in a prediction of the cosmic ray flux everywhere in the Galaxy. Picard is a prominent example for the current transition from two-dimensional azimuthally symmetric models of Galactic cosmic-ray transport to those that allow higher degrees of realism. In Picard this is achieved by use of contemporary numerical solvers that allow efficient computation of very high resolution models. I will address the new physics that can be incorporated in such three-dimensional models, e.g. example problems like the transition from axisymmetric cosmic-ray source distributions to spiral-arm cosmic-ray source distributions, including consequences for the various observables related to cosmic rays.