Flux predictions in the transition region incorporating the effects from propagation of cosmic rays in the Galactic magnetic field

Galactic cosmic rays (GCRs) and (anisotropically injected) extragalactic cosmic rays (EGCRs) are both affected by the Galactic magentic field (GMF) on their voyage to Earth at energies pertaining to the transition from GCRs to EGCRs, such that their flux, composition and arrival directions are modif...

Full description

Saved in:
Bibliographic Details
Published in:EPJ Web of Conferences 2023, Vol.283, p.3006
Main Authors: Kääpä, Alex, Kampert, Karl-Heinz, Becker Tjus, Julia
Format: Article
Language:English
Subjects:
Anisotropy
Cosmic ray propagation
Cosmic rays
Galactic cosmic rays
Interstellar magnetic fields
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Galactic cosmic rays (GCRs) and (anisotropically injected) extragalactic cosmic rays (EGCRs) are both affected by the Galactic magentic field (GMF) on their voyage to Earth at energies pertaining to the transition from GCRs to EGCRs, such that their flux, composition and arrival directions are modified. GCRs increasingly leak from the Galaxy with rising energy, leading to a flux suppression. The flux modification imposed on EGCRs is more complex, but may exhibit (subtle) spectral breaks depending on the direction and nature of the injected anisotropy. Using a full Monte Carlo approach with CRPropa and making realistic and minimal assumptions about the injected GCR and EGCR fluxes, we derive a prediction of the total all-particle flux in the transition region. We find that it cannot account for the flux measured by various cosmic ray experiments in this energy range. This calls for the need of an additional component to the flux in the transition region.
ISSN:2100-014X
2101-6275
2100-014X
DOI:10.1051/epjconf/202328303006