Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 103: Cosmic rays IV

T 103.2: Talk

Friday, April 3, 2020, 11:15–11:30, L-3.002

Propagation in the Galactic magnetic field: Effects on the spectrum, composition and anisotropy of Galactic and extragalactic cosmic rays * — •Alex Kääpä for the Pierre Auger collaboration — Bergische Universität Wuppertal, Gaußstr. 20, 42119 Wuppertal

In the energy range signifying the transition from Galactic to extragalactic cosmic rays (GCRs and EGCRs), current cosmic ray source and propagation models fail to describe the observed flux above PeV energies. This calls for modifications to such models, the nature of which may be found in the study of the Galactic magnetic field (GMF), as it exhibits a range of effects on the propagation of cosmic rays. 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 GCRs are concentrated in the Galactic plane. At highest rigidities, particles are hardly affected by the GMF.
In this talk, I will present the consequences of these propagation effects on the spectrum, composition and anisotropy of both GCRs and EGCRs with special focus on how this may help elucidate the missing predicted flux in the transition region.

* Gefördert durch die BMBF Verbundforschung Astroteilchenphysik (Vorhaben 05A17PX1).