Physics
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978soph...56..429s&link_type=abstract
Solar Physics, vol. 56, Feb. 1978, p. 429-438. National Research Council of Canada
Physics
1
Anisotropic Media, Collisional Plasmas, Solar Wind, Asymptotic Methods, Coulomb Collisions, Electron Scattering, Proton Energy
Scientific paper
The collisional equations for the solar wind assuming steady spherically symmetric flow and including thermal conduction and an anisotropic proton temperature are analyzed in the absence of a heat source function. The equations are cast in a form that involves one dimensionless parameter, effectively equal to the inverse Peclet number for protons, and the small quantity epsilon, the square root of the electron-proton mass ratio. Analytic forms for the proton temperature anisotropy and other flow variables are derived by applying the limit epsilon approaches zero, and using asymptotic techniques. It is found that the model based purely on Coulomb collisions predicts values for the proton temperature anisotropy in the vicinity of the earth that are much smaller than those observed, and that increasing the coronal base temperature serves to decrease the predicted anisotropy still further.
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