Greifswald 2024 – scientific programme

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EP: Fachverband Extraterrestrische Physik

EP 7: Sun and Heliosphere II

EP 7.8: Talk

Thursday, February 29, 2024, 15:45–16:00, ELP 6: HS 2

Impact of diffusion models on the spectra obtained by diffusive shock acceleration — •Dominik Walter, Horst Fichtner, Yuri Litvinenko, and Frederic Effenberger — Ruhr-Universität-Bochum

The process of shock acceleration has long been a topic in astrophysics. A very prominent point of discussion is the shock spectrum, which has prooved quite universal over the last decades. In recent years, however, there have been modifications made to the diffusive behaviour of the acceleration process, some of which seem to alter said shock spectrum. Mentioned modifications are based on e.g. fractional or nonlinear diffusion approaches. This presentation will give a few examples and discuss, when a change of the spectral behaviour is to be expected and why.

Keywords: Shock acceleration; Nonlinear diffusion; Fractional diffusion