Transport and Interactions of Cosmic Rays – Linking Source Models to Observations
Lukas Merten (Ruhr-Universitaet Bochum)
Tuesday 28/11/2023 @ 14:00, Sala Antonio Sollima (IV piano Battiferro)
Despite the large progress in measuring properties of cosmic rays that has been made – thanks ever improving instruments – during the last decade, the exact sources of these ultra-high energy particles remain unclear. Cosmic rays are charged particles and will be deflected in extragalactic and Galactic magnetic fields. Their arrival directions do not pinpoint back to their production site making it almost impossible to directly learn something about the sources. Modeling the transport and interactions starting in the sources down to Earth is therefore an inevitable part in understanding the origin of cosmic rays. In this talk, I will explain different concepts to describe the propagation of cosmic rays: Single particle full orbit simulation, ensemble averaged transport equations, and non-linear energy flux modelling. The advantages and disadvantages of the different approaches are discussed using the CRPropa and CR-ENTREES software frameworks as examples.