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Jul 26 – 30, 2021
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Implications of turbulence dependent diffusion on cosmic ray spectra

Jul 27, 2021, 10:20 AM


Parallel session talk Astroparticle and Gravitational Waves T01: Astroparticle and Gravitational Waves


Julien Dörner (Ruhr University Bochum, RAPP-Center)


The propagtion of cosmic rays can be described by diffusive motion in most galactic enviroments. Therfore, a detailed knowlege of the diffusion tensor is necessary. Recent analyses of the energy dependence of the diffusion tensor show a function of the turbulence level $b/B$, i.e. $\kappa_i \propto E^{\gamma_i}$ with $\gamma_i = \gamma_i(b/B)$, where $i\in \{\parallel, \perp\}$. (Reichherzer et al, MNRAS 498:5051–5064 (2020))

In this talk we show the implication of this turbulence-dependent diffusion on the radial dependence of the cosmic-ray spectral index and the transition between parallel and perpendicular component. Finally, we interpret the cosmic-ray gradient detected by Fermi in the light of these findings.

First author Julien Dörner
Collaboration / Activity n/a

Primary author

Julien Dörner (Ruhr University Bochum, RAPP-Center)


Patrick Reichherzer (Ruhr University Bochum, RAPP-Center) Dr Lukas Merten (University of Innsbruck) Julia Tjus (Ruhr-Universität Bochum) Horst Fichtner (Ruhr University Bochum) Dr M.J. Pueschel (Eindhoven University of Technology, Duthc Insitute for Fundamental Energy Research) Prof. Ellen Zweibel (University of Wisconsin, )

Presentation materials