PoS - Proceedings of Science
Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Cosmic-Ray Physics (Indirect, CRI)
Influence of Galactic magnetic fields on UHECR energy spectrum and mass composition on the Earth
R. Higuchi*, T. Fujii, K. Kawata, E. Kido, S. Nagataki and T. Sako
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Pre-published on: August 18, 2023
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Abstract
Considering source population, mass composition, and propagation in magnetic fields is important to reveal the origin of ultrahigh-energy cosmic rays (UHECRs). Currently, Telescope Array (TA) and Auger experiments have observed the energy spectrum, mass composition, and anisotropy of arrival directions at an ultrahigh-energy scale. On the other hand, the interpretation of these observables is strongly affected by model assumptions. In our previous works, we investigated the effect of the Galactic magnetic field (GMF) on the anisotropy of arrival directions through the analysis of the mock datasets and found that contributions of the starburst galaxy are underestimated. In this study, we apply the technique in previous studies and investigate the effect of GMF on the energy spectrum and mass composition. We especially discuss the discrepancy in energy spectrum between the northern and southern hemispheres reported by the TA and Auger experiments.
DOI: https://doi.org/10.22323/1.444.0460
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