Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 73: Cosmic Ray 4

T 73.2: Vortrag

Mittwoch, 23. März 2022, 16:30–16:45, T-H32

Incorporating the Galactic magnetic field into the propagation effects of cosmic rays in the transition region* — •Alex Kääpä — Bergische Universität Wuppertal, Gaußstr. 20, 42119 Wuppertal

In the energy range signifying the transition from Galactic to extragalactic cosmic rays (GCRs and EGCRs), propagation in the Galactic magnetic field (GMF) changes from diffusive to ballistic. This leads to a range of observable effects vital to understanding the respective contributions of GCRs and EGCRs to the total flux. GCRs more readily leak out of the Galaxy with increasing energy and, hence, the flux arriving at Earth is suppressed. EGCRs experience two competing effects, shielding from as well as confinement in the Galactic plane, both of which weaken with energy. These effects have been re-confirmed to cancel exactly in the case of isotropic injection. Flux modifications can occur in the case of an anisotropic EGCR flux into the Galaxy. Their nature depends both on the type and direction of the anisotropy.

In this talk, we present the propagation effects that the GMF imposes on the flux of GCRs and EGCRs. We incorporate these into minimal, experimentally and theoretically motivated injection spectra of GCRs and EGCRs. With this incorporation, we seek to retrieve a more realistic picture of the expected flux arriving at Earth, and to better estimate the nature and degree of possible additional contributions to the injected flux.

* Gefördert durch die BMBF Verbundforschung Astroteilchenphysik (Vorhaben 05A20PX1).