Magnetic mirroring and cosmic ray pitch-angle diffusion

Details Magnetic mirroring and cosmic ray pitch-angle diffusion Magnetic mirroring and cosmic ray pitch-angle diffusion

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998phrve..58.4033j&link_type=abstract

Physical Review E (Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics), Volume 58, Issue 3, September 19

Physics

Particle Orbits, Transport Properties, Magnetohydrodynamics And Plasmas

Scientific paper

Both quasilinear and nonlinear theories of cosmic ray scattering in fluctuating electric and magnetic fields are usually based on (renormalized) first-order perturbation theories, resulting in scattering parameters that depend functionally only on the variance and two-point correlation functions of the random fields. I show that these theories must fail to predict scattering of particles with pitch angles close to 90° since mirroring effects are not determined by these statistical quantities. This is shown by a comparison of Monte Carlo simulations in fields with the same covariance functions, but differing in the variability of the absolute value of the total magnetic field. Additionally, I report some numerical evidence that mirroring can be nondiffusive in some cases.

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