Computer Science – Numerical Analysis
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229..812k&link_type=abstract
Astrophysical Journal, Part 1, vol. 229, Apr. 15, 1979, p. 812-820. Deutsche Forschungsgemeinschaft
Computer Science
Numerical Analysis
19
Charged Particles, Energetic Particles, Magnetic Charge Density, Magnetic Disturbances, Magnetic Field Configurations, Transport Properties, Coherent Radiation, Diffusion Coefficient, Fokker-Planck Equation, Magnetic Fields, Magnetohydrodynamics, Numerical Analysis, Particle Size Distribution
Scientific paper
The propagation of energetic charged particles in weak magnetic fluctuations with a diverging mean field component is considered using a perturbation approach. Analytical formulae are obtained. In first order, the transport of the isotropic particle density is a coherent streaming of the initial particle distribution; in second order, there is also a dispersive spreading. In the limiting case of weak focusing of the particles in the diverging mean field, the new transport mode reduces to ordinary diffusion; when focusing is strong, it gives the supercoherent propagation found by Earl. At late times, the dispersion is negligible and the intensity decay is exponential.
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