Caustic-like Structures in UHECR Flux after Propagation in Turbulent Intergalactic Magnetic Fields
High Energy Astrophysical Phenomena
2023-07-26 v1
Abstract
UHECR propagation in a turbulent intergalactic magnetic field in the small-angle scattering regime is well understood for propagation distances much larger than the field coherence scale. The diffusion theory doesn't work and unexpected effects may appear for propagation over smaller distances, from a few and up to 10-20 coherence scales. We study the propagation of UHECRs in this regime, which may be relevant for intermediate mass UHECR nuclei and nG scale intergalactic magnetic fields with 1 Mpc coherence scale. We found that the trajectories form a non-trivial caustic-like pattern with strong deviation from isotropy. Thus, measurements of the flux from a source at a given distance will depend on the position of the observer.
Keywords
Cite
@article{arxiv.2212.01494,
title = {Caustic-like Structures in UHECR Flux after Propagation in Turbulent Intergalactic Magnetic Fields},
author = {K. Dolgikh and A. Korochkin and G. Rubtsov and D. Semikoz and I. Tkachev},
journal= {arXiv preprint arXiv:2212.01494},
year = {2023}
}