Cosmic Rays in Intermittent Magnetic Fields
  The propagation of cosmic rays in turbulent magnetic fields is a diffusive
process driven by the scattering of the charged particles by random magnetic
fluctuations. Such fields are usually highly intermittent, consisting of
intense magnetic filaments and ribbons surrounded by weaker, unstructured
fluctuations. Studies of cosmic ray propagation have largely overlooked
intermittency, instead relying on Gaussian random magnetic fields. Using test
particle simulations, we investigate cosmic ray diffusivity in intermittent,
dynamo-generated magnetic fields. The results are compared with those obtained
from non-intermittent magnetic fields having identical power spectra. The
presence of magnetic intermittency significantly enhances cosmic ray diffusion
over a wide range of particle energies. We demonstrate that the results can be
interpreted in terms of a correlated random walk.
