Table of Contents
ISRN High Energy Physics
Volume 2012, Article ID 673250, 5 pages
Research Article

The Characteristics of Cosmic Rays in a Fractal Medium

Faculty of Physics, Shahid Bahonar University of Kerman, Kerman 76169-14111, Iran

Received 18 December 2011; Accepted 12 January 2012

Academic Editors: G. Di Sciascio and A. S. Tonachini

Copyright © 2012 S. Doostmohammadi and S. J. Fatemi. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We consider the galactic propagation of cosmic rays with energies below the knee of the cosmic ray spectrum (at 3 × 1 0 6  GeV). Lagutin and his colleagues suggested that propagation in a fractal medium would be an appropriate model for such particles and pointed out that a different diffusion equation to that usually assumed is then required. We present results of calculations using a diffusion equation appropriate to an inhomogeneous medium. These results are encouraging and can fit properties of the energy density of cosmic rays using the supernova model of Erlykin and Wolfendale. The containment time of cosmic rays, in such a modeling of propagation in a fractal medium, is discussed.