A nonlinear theory of cosmic ray pitch angle diffusion in homogeneous magnetostatic turbulence

Details A nonlinear theory of cosmic ray pitch angle diffusion in homogeneous magnetostatic turbulence A nonlinear theory of cosmic ray pitch angle diffusion in homogeneous magnetostatic turbulence

Apr 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ntcp.book.....g&link_type=abstract

A nonlinear theory of cosmic-ray pitch-angle diffusion in homogeneous magnetostatic turbulence., by Goldstein, M. L.. NASA-TM-X

Physics

Cosmic Rays, Magnetohydrodynamics, Plasmas (Physics), Turbulence, Correlation, Nonlinearity, Pitch (Inclination), Scattering

Scientific paper

A plasma strong turbulence, weak coupling, theory is applied to the problem of cosmic ray pitch angle scattering in magnetostatic turbulence. The theory used is a rigorous generalization of Weinstock's resonance-broadening theory and contains no ad hoc approximations. A detailed calculation is presented for a model of slab turbulence with an exponential correlation function. The results agree well with numerical simulations. The rigidity dependence of the pitch angle scattering coefficient differs from that found by previous researchers. The differences result from an inadequate treatment of particle trajectories near 90 deg pitch angle in earlier work.

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