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T: Fachverband Teilchenphysik

T 16: Cosmic Rays V

T 16.3: Vortrag

Montag, 15. März 2021, 16:30–16:45, Tp

Propagation in the Galactic magnetic field: Effects on the spectrum, composition, and anisotropy of Galactic and ex- tragalactic cosmic rays * — •Alex Kääpä, Eric Mayotte, and Karl-Heinz Kampert — Bergische Universität Wuppertal, Gaußstr. 20, 42119 Wuppertal

In the energy range signifying the transition from Galactic to extra-galactic cosmic rays (GCRs and EGCRs), current cosmic ray source and propagation models fail to describe the observed flux above PeV energies. This is partly due to the complicated effects the Galactic magnetic field (GMF) imposes on both GCRs and EGCRs, as the propagation regime of cosmic rays in the GMF transitions from diffusive to ballistic. At the lowest rigidities, near the end of the diffusive regime, GCRs are trapped in, and EGCRs are effectively shielded from the Galaxy. At intermediate rigidities, the EGCRs that reach the Galaxy and the GCRs are concentrated in the Galactic plane where they propagate diffusively. At highest rigidities, particles are hardly affected by the GMF. In this talk, we present the consequences of these propagation effects on the spectrum, composition, and anisotropy of both GCRs and EGCRs based on CRPropa simulation. Special focus will given on how these results may help elucidate the missing predicted flux in the transition region.

*Supported by the BMBF Verbundforschung Astroteilchenphysik (Vorhaben 05A17PX1).