Pitch Angle Diffusion Coefficient in an Extended Quasi-linear Theory

Details Pitch Angle Diffusion Coefficient in an Extended Quasi-linear Theory Pitch Angle Diffusion Coefficient in an Extended Quasi-linear Theory

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...453..890n&link_type=abstract

Astrophysical Journal v.453, p.890

Astronomy and Astrophysics

Astronomy

20

Acceleration Of Particles, Diffusion, Interplanetary Medium, Magnetohydrodynamics: Mhd, Sun: Particle Emission

Scientific paper

Using an extended quasi-linear theory that takes account of the distribution of medium-scale background interplanetary magnetic field, we calculate the pitch angle diffusion coefficients of interplanetary energetic ions, for a slab turbulence model consisting of a superposition of parallel and antiparallel transverse R and L waves. Our results show that the background variation broadens the resonance function significantly at pitch angles near 90°, so that protons down to ≍ 25 keV interact with hydromagnetic waves at all pitch angles, and the steepening of the magnetic field power spectrum in the dissipation range does not result in a resonance gap or infinite scattering mean free path.

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