MR. AMIT SETA

Cosmic rays, highly energetic charged particles, are an important component of the interstellar medium (ISM) in galaxies as they have energy density close to the thermal gas, turbulence and magnetic fields. The cosmic rays diffuse through the ISM both due to the random walk of magnetic field lines and scattering by magnetic waves. The propagation of cosmic rays is usually analyzed in Gaussian random fields. However, spatial intermittency is unavoidable in interstellar medium due to compression by random shocks and fluctuation dynamo action. We study the propagation of cosmic rays in random and intermittent magnetic field generated by the fluctuation dynamo. The presence of magnetic intermittency significantly enhances cosmic ray diffusion in a certain range of energies. The results are interpreted in terms of a correlated random walk. Infact, we obtain that the cosmic rays below a certain energy, always perform a correlated random walk rather than the usual Brownian motion.