2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/3060We consider the propagation of galactic cosmic rays in the fractal interstellar medium. Steady state solution of the fractional diffusion equation, describing cosmic ray propagation, is found. We show that the exponent of the steady state spectrum turns out to be equal to the exponent of the cosmic ray spectrum above the "knee", that is approximately equal to 3.1.3 pages; Proc. of the 27th ICRCAstrophysicstext