Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...198..485l&link_type=abstract
Astrophysical Journal, vol. 198, June 1, 1975, pt. 1, p. 485-492. Research supported by the Max-Planck-Institut für Physik und
Astronomy and Astrophysics
Astrophysics
33
Cosmic Rays, Magnetohydrodynamic Waves, Particle Diffusion, Solar Wind, Diffusion Coefficient, Partial Differential Equations, Pitch (Inclination), Polarization Characteristics, Power Spectra, Tensor Analysis
Scientific paper
Pitch-angle (and energy) diffusion of cosmic rays in hydromagnetic wave fields is considered. The treatment remains strictly within the quasi-linear approximation. It is shown that the popular assumption of an isotropic power spectrum tensor of magnetic fluctuations requires in this case equal forms and magnitudes of Alfven and magnetosonic wave spectra - a situation which is generally unlikely. The relative contributions to the pitch-angle diffusion coefficient from the cyclotron resonances and Landau resonance due to the different types of waves are evaluated for a typical situation in the solar wind. Since the Landau resonance in this approximation also does not lead to particle reflections, a proper consideration of the nonlinear particle orbits is indeed necessary to overcome the well-known difficulties of quasi-linear scattering theory for cosmic rays near 90 deg pitch angle.
Lee Martin A.
Voelk Heinrich J.
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