Dortmund 2021 – scientific programme
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T: Fachverband Teilchenphysik
T 16: Cosmic Rays V
T 16.1: Talk
Monday, March 15, 2021, 16:00–16:15, Tp
Turbulence level dependent investigation of the cosmic ray diffusion coefficient — •Leander Schlegel1,2, Patrick Reichherzer1,2,3, Julia Becker Tjus1,2, Lukas Merten4, Antonius Frie1,2, Björn Eichmann1,2, Moritz Püschel5, and Ellen Zweibel6 — 1RuhrUniversity Bochum, Theoretical Physics IV — 2Ruhr Astroparticle and Plasma Physics (RAPP) Center — 3Irfu, CEA Paris-Saclay — 4Institute for Astro-& Particle Physics, University of Innsbruck — 5Dutch Institute for Fundamental Energy Research, 5612 AJ Eindhoven, The Netherlands — 6Department of Astronomy & Physics, University of WisconsinMadison
Understanding the transport of energetic cosmic rays belongs to the most challenging topics in astrophysics. The complicated evolution of the cosmic-ray distribution can be modeled mathematically by a diffusive process in the limit of large times. Consequently, diffusion is of fundamental importance in the transport of cosmic rays through turbulence. We show that at turbulence levels b/B above 5% of the total magnetic field, the approximation of an energy dependence E^(1/3) as predicted for a Kolmogorov spectrum within Quasi-Linear Theory does not hold. Different energy regimes also lead to specific diffusive behaviour, especially for low energies magnetic mirroring could have a relevant influence on the diffusion. Using a gridless synthetic turbulence model, we therefore investigate the diffusion coefficients behaviour in more detail dependent on E and b/B.