Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

T: Fachverband Teilchenphysik

T 62: Cosmic Rays III

T 62.2: Vortrag

Mittwoch, 18. März 2026, 16:30–16:45, KS 00.006

Temporal and Geometrical Effects of the GMF on UHECRs — •Veronika Vašíčková, Leonel Morejon, and Karl-Heinz Kampert for the Pierre Auger collaboration — Wuppertal, Germany

To understand the origin of the Ultra-High-Energy Cosmic Rays (UHECRs), it is important to explain features of their spectrum, as well as their arrival directions. Currently, this is done with modelling approaches neglecting time evolution, especially in the galactic magnetic field (GMF). We study the influence of the GMF on the arrival direction of UHECRs and on the spectrum, with the emphasis on temporal and geometrical effects, investigating the rigidity-dependent residence time of extragalactic cosmic rays entering our Galaxy using CRPropa. We probe both constant and time-varying flux scenarios and find that UHECRs entering the Milky Way can experience delays of hundreds of kiloyears. This temporal effect modifies the spectrum, introducing features such as a rigidity-dependent enhancement of the flux, a suppression of particles between 10¹⁸−10¹⁹ V, or a natural softening of spectra with time. The comparatively short residence time of particles above a certain rigidity could explain the common maximum rigidity needed to describe the UHECR spectrum.

*Supported by DFG (SFB 1491)

Keywords: Cosmic Rays; Galactic Magnetic Field; Spectrum of UHECRs; Arrival Directions; Temporal Delays