Physics – Plasma Physics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...250..266a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 250, no. 1, Oct. 1991, p. 266-279.
Physics
Plasma Physics
33
Cosmic Plasma, Cosmic Rays, Magnetoplasmadynamics, Particle Acceleration, Plasma Physics, Plasma Turbulence, Astrophysics, Charged Particles, Transport Theory
Scientific paper
The Fokker-Planck equation for the movement of charged particles in a slab turbulence of transversal plasma fluctuations superimposed on a homogeneous magnetic field, including all phase-space variables, is rederived using a guiding center coordinate system. In contrast to previous studies, dispersive effects are included and a wavelength range larger than only Alfven waves is considered. Ion cyclotron waves and Whistler waves as well as Alfven waves are used to investigate the pitch-angle diffusion of electrons by Alfven waves. It is shown that diffusion perpendicular to the magnetic field is only caused by waves with zero wave numbers. A cosmic-ray transport equation is derived from the present equation, assuming gyrophase and pitch-angle diffusion to be the fastest processes, thus making the use of nearly isotropic distributions realistic.
Achatz Ulrich
Schlickeiser Reinhard
Steinacker Juergen
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