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EP: Fachverband Extraterrestrische Physik
EP 12: Sun and Heliosphere V
EP 12.3: Vortrag
Donnerstag, 3. April 2025, 17:00–17:15, ZHG101
Superdiffusive acceleration at heliospheric shocks — •Horst Fichtner1,2, Sophie Aerdker1, Frederic Effenberger1, Lukas Merten1, and Dominik Walter1 — 1Institut fuer Theoretische Physik IV: Ruhr-Universitaet Bochum — 2Research Department Plasmas with Complex Interactions, Ruhr-Universitaet Bochum
A classical paradigm for the acceleration of energetic particles is the diffusive shock acceleration. For many years this first-order Fermi process was the preferred one to explain the origin of Galactic cosmic rays and of various heliospheric populations, like anomalous cosmic rays or solar energetic particles. In recent years, the evidence has increased, that anomalous transport leading to superdiffusive shock acceleration appears to play a role in the energization of charged particles at shocks. Corresponding numerical simulations have to be based on the solution of fractional partial differential equations, either via finite difference methods or equivalent stochastic differential equations. In the talk both methods will be briefly described, their results for selected cases will compared, and open questions will be discussed. *supported by SFB1491
Keywords: shock acceleration; superdiffusion; anomalous transport; cosmic rays; energetic particles