Quasilinear theory of cosmic ray pitch-angle diffusion for generalized turbulence models

Details Quasilinear theory of cosmic ray pitch-angle diffusion for generalized turbulence models Quasilinear theory of cosmic ray pitch-angle diffusion for generalized turbulence models

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992angeo..10..541j&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 10, no. 8, Aug. 1992, p. 541-546. Research supported by Studienstiftung des Deutschen

Physics

3

Charged Particles, Cosmic Rays, Diffusion Coefficient, Energetic Particles, Solar Wind, Turbulence Models, Fokker-Planck Equation, Interplanetary Medium, Magnetohydrodynamic Waves, Particle Diffusion, Solar Magnetic Field

Scientific paper

The pitch-angle diffusion coefficient D(mu-mu) is calculated for a class of models with wave-number dependent cutoff-angles in the magnetic fluctuation spectra for energetic charged particles in partially random magnetic fields. The quasi-linear theory predicts important differences between a number of these models and the popular slab model, even if the cutoff-angles are very small. The slab model can be used as an approximation for these models only if the cutoff-angle decreases at least inversely proportional to the wave number. For constant or slowly falling cutoff-angles, the values of D(mu-mu) is reduced in a way that can lead to very large values of the mean free path of cosmic rays in the solar wind.

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