Coulomb self-collision frequencies for non-thermal velocity distributions in the solar wind

Details Coulomb self-collision frequencies for non-thermal velocity distributions in the solar wind Coulomb self-collision frequencies for non-thermal velocity distributions in the solar wind

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985angeo...3..545m&link_type=abstract

Annales Geophysicae (ISSN 0755-0685), vol. 3, Sept.-Oct. 1985, p. 545-555.

Physics

6

Collision Rates, Collisionless Plasmas, Coulomb Collisions, Solar Wind Velocity, Velocity Distribution, Electron Distribution, Ion Distribution, Landau Factor

Scientific paper

Coulomb self-collision frequencies are evaluated for non-thermal velocity distributions for solar wind ions and electrons. First, the general Landau collision integral is revisited and rewritten in a relaxation time form that involves the new concept of an effective collision rate. This frequency and also the rates associated with longitudinal and transverse diffusion and with collisional friction are then calculated for model distributions composed of multiple drifting Maxwellians. Second, numerical results for typical observed double-humped and heat flux carrying particle distributions are presented and discussed in terms of contour plot and one-dimensional cuts parallel and perpendicular to the magnetic field. In this way insight is provided into the collisional reshaping of realistic particle distributions by velocity space diffusion and friction. Finally, some conclusions are drawn with respect to Coulomb collision moderated transport in the solar wind and in tenuous space plasmas.

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