Diffusive Origin of the Cosmic-Ray Spectral Hardening
High Energy Astrophysical Phenomena
2015-06-11 v1
Abstract
Recent data from ATIC, CREAM and PAMELA revealed that the energy spectra of cosmic ray (CR) nuclei above 100 GeV/nucleon experience a remarkable hardening with increasing energy. This effect cannot be recovered by the conventional descriptions of CR acceleration and diffusive propagation processes. Using analytical calculations, I show that the hardening effect can be consequence of a spatial change of the CR diffusion properties in different regions of the Galaxy. I discuss the implications of this scenario for the main CR observables and its connections with the open issues of the CR physics.
Keywords
Cite
@article{arxiv.1210.7274,
title = {Diffusive Origin of the Cosmic-Ray Spectral Hardening},
author = {N. Tomassetti},
journal= {arXiv preprint arXiv:1210.7274},
year = {2015}
}
Comments
4 pages, 1 figure, 23rd ECRS, Moscow, 2012