A nonlinear theory of cosmicray pitchangle diffusion in homogeneous magnetostatic turbulence.
Abstract
A plasma strong turbulence, weak coupling, theory is applied to the problem of cosmicray pitchangle 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 pitchangle 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.
 Publication:

The Astrophysical Journal
 Pub Date:
 March 1976
 DOI:
 10.1086/154239
 Bibcode:
 1976ApJ...204..900G
 Keywords:

 Cosmic Rays;
 Homogeneous Turbulence;
 Magnetostatic Fields;
 Particle Diffusion;
 Plasma Turbulence;
 Radiation Distribution;
 Astronomical Models;
 Interplanetary Magnetic Fields;
 Interstellar Magnetic Fields;
 Particle Theory;
 Particle Trajectories;
 Scattering Coefficients;
 Space Radiation