Physics – Fluid Dynamics
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...424l.143w&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 424, no. 2, p. L143-L146
Physics
Fluid Dynamics
4
Cosmic Rays, Fluid Dynamics, Magnetohydrodynamic Waves, Mathematical Models, Photosphere, Plasmas (Physics), Proton Density (Concentration), Solar Wind, Electron Distribution, Heat Flux, Magnetic Fields, Mean Free Path, Monte Carlo Method, Space Density
Scientific paper
A model expression of the proton heat flux for collisionless, nearly isotropic plasmas is presented. The motivation is to allow a more realistic representation of the proton heat transport in models of the solar wind than that obtained by using the usual collisional expression. There is a single free parameter in the heat flux that represents the cumulative effect of a presumed relaxation to isotropy of the distribution. In addition to a term proportional to the gradient of the temperature, the heat flux also contains a term proportional to both the acceleration vector of the fluid and to the acceleration due to gravity. The form of the heat flux presented is valid for particles of all energies, and the contribution from energetic particles (cosmic rays) is implicit.
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