SMuK 2023 – scientific programme

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T: Fachverband Teilchenphysik

T 92: Cosmic Ray IV

T 92.1: Talk

Wednesday, March 22, 2023, 17:30–17:45, POT/0013

Modeling Diffusive Shock Acceleration with CRPropa^* — •Sophie Aerdker^1,2, Lukas Merten^1,2, Julia Becker Tjus^1,2, Dominik Walter^1,2, Frederic Effenberger^1,2, and Horst Fichtner^1,2 — ¹Ruhr-Universität Bochum — ²RAPP Center Bochum

Ultra high energy cosmic rays are most likely accelerated stochastically in time-dependent, turbulent magnetic field structures present in astrophysical sources and the interstellar medium. One of such processes is Diffusive Shock Acceleration: Diffusive particles gain energy by repeatedly crossing a shock front. The stochastic nature of this process leads to the characteristic power-law spectrum. We study Diffusive Shock Acceleration using a stochastic differential equation solver (DiffusionSDE) of the cosmic-ray propagation framework CRPropa3.2. We show that the expected spectra are reproduced for various configurations, from one-dimensional planar shocks to three-dimensional spherical shocks. The effect of anisotropic diffusion is discussed and how different injection spectra change the resulting spectrum. We clarify constraints for modeling Diffusive Shock Acceleration using stochastic differential equations.

^*Supported by DFG (SFB 1491)