Physics
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jatp...55.1583d&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 55, no. 11-12, p. 1583-1594.
Physics
6
Collisionless Plasmas, Plasma Diffusion, Space Plasmas, Transport Theory, Boltzmann Transport Equation, Mathematical Models, Monte Carlo Method
Scientific paper
The steady-state diffusion of a minor species through a static background species is studied using a Monte Carlo model and a generalized 16-moment transport model. The two models are in excellent agreement in the collision-dominated region and in the 'transition region'. In the 'collisionless' region the 16-moment solution contains two singularities, and physical meaning cannot be assigned to the solution in their vicinity. In all regions, agreement between the models is best for the distribution function and for the lower-order moments and is less good for higher-order moments. Moments of order higher than the heat flow and hence beyond the level of description provided by the transport model have a noticeable effect on the shape of distribution functions in the collisionless region.
Barakat Abdallah R.
Demars Howard G.
Schunk Robert W.
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