Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 21: Kosmische Strahlung, Propagation

T 21.5: Talk

Monday, March 25, 2019, 17:00–17:15, ST 7

Statistical fluctuations of extragalactic cosmic rays in the Galactic magnetic field — •Alex Kääpä — Gaußstr. 20, 42119 Wuppertal

To account for the flux measured in the energy spectrum of cosmic rays between the so-called ``knee'' and ``ankle'', where the transition from galactic to extragalactic cosmic rays occurs, additions to existing models of cosmic ray acceleration as well as propagation are required. While some proposals for acceleration and propagation mechanisms exist (i.e. re-acceleration or spallation), understanding the bulk propagation of cosmic rays in the Galaxy is vital, particularly for those of extragalactic origin, where rigidity-dependent statistical fluctuations in arrival directions are still possible. In this talk, CRPropa simulations of said fluctuations, focusing on concentration effects in the Galactic magnetic field, will be presented and the possibility to measure these with cosmic ray observatories will be discussed.