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SYMD: Symposium SMuK Dissertation Prize 2020

SYMD 1: SMuK Dissertation Prize 2020

SYMD 1.3: Hauptvortrag

Montag, 30. März 2020, 15:30–16:00, H-Aula/HS I/HS X

Anisotropic Transport of Galactic Cosmic Rays based on Stochastic Differential Equations — •Lukas Merten — University of Innsbruck, Innsbruck, Austria — Ruhr University Bochum, Bochum, Germany

The sources of cosmic rays (CRs) are not yet unambiguously revealed. The deflection of charged CRs in magnetic fields makes an inference of the CR origin by observation of their arrival direction impossible. Modelling the transport of CRs allows to indirectly learn about their sources.

In this work, a new opportunity to describe the anisotropic transport in arbitrary magnetic background fields is introduced. Here, the equivalence between Fokker-Planck and stochastic differential equations is used. In doing so, the solution of the transport equation does not need to be discretized on a spatial grid. This method has been implemented as part of the open source software CRPropa.

The software extension allowed to model the large influence of the magnetic field morphology on observable quantities, like the stationary distribution of cosmic rays. Furthermore, the Galactic termination shock is examined as a possible source for CRs in the range above the knee at PeV energies.