A collisional kinetic model of the polar wind

Details A collisional kinetic model of the polar wind A collisional kinetic model of the polar wind

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...10311701p&link_type=abstract

Journal of Geophysical Research, Volume 103, Issue A6, p. 11701-11710

Physics

Plasma Physics

16

Ionosphere: Polar Cap Ionosphere, Ionosphere: Ionosphere/Magnetosphere Interactions, Ionosphere: Modeling And Forecasting, Space Plasma Physics: Kinetic And Mhd Theory

Scientific paper

The effects of Coulomb collisions in the transition region between the collision-dominated regime at low altitudes and the collisionless regime at high altitudes have been taken into account to study the escape of H+ ions in the polar wind. A specialized spectral method is used to solve the steady state Fokker-Planck equation describing the diffusion and upward bulk motion of H+ ions through a background of O+ ions. The H+ ion velocity distribution function is determined as a function of altitude for realistic initial conditions in the whole velocity space. We emphasize the importance for a correct choice of the boundary conditions at v=0 to obtain regular mathematical solutions. The results of this kinetic model are compared with results of earlier polar wind models based on different approximations of the plasma transport equations.

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