Coulomb collision rates for self-similar and kappa distributions

Details Coulomb collision rates for self-similar and kappa distributions Coulomb collision rates for self-similar and kappa distributions

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985phfl...28.1379m&link_type=abstract

Physics of Fluids (ISSN 0031-9171), vol. 28, May 1985, p. 1379-1386.

Physics

21

Coulomb Collisions, Magnetohydrodynamics, Space Plasmas, Thermodynamic Equilibrium, Transport Properties, Variational Principles, Distribution Functions, Earth Magnetosphere, Fokker-Planck Equation, Fourier Series, Solar Wind, Stellar Winds

Scientific paper

The Coulomb collision operator for two nonthermal particle distributions, the self-similar and kappa distributions, is investigated theoretically. Associated friction and diffusion rates are evaluated and calculated numerically as a function of velocity. It is shown that the full collision term can be cast into a relaxation-time form with an effective collision rate which differs drastically from the smooth overall diffusion rates and is very sensitive to the shape of the distribution. Numerical results for the effective rates are presented, and the relevance of the present analysis to observed distributions in space plasmas and to quasi-linear turbulence is discussed.

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