Numerical calculations relevant to the initial expansion of the polar wind

Details Numerical calculations relevant to the initial expansion of the polar wind Numerical calculations relevant to the initial expansion of the polar wind

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.9154s&link_type=abstract

Journal of Geophysical Research, vol. 87, Nov. 1, 1982, p. 9154-9170.

Physics

55

Magnetoplasmadynamics, Magnetospheric Ion Density, Polar Regions, Space Plasmas, Earth Ionosphere, Electron Energy, Electron Plasma, Hydrogen Ions, Ionospheric Electron Density, Ionospheric Ion Density, Magnetohydrodynamic Flow, Magnetospheric Electron Density, Oxygen Ions, Plasma Density, Positive Ions, Vacuum

Scientific paper

The results of a numerical simulation of the expansion of an H(+)-0(+) electron plasma into a vacuum are reported. Variations were introduced in the ionic density ratios, the scale lengths for the density gradient at the plasma-vacuum interface, and the initial electron-ion temperature ratio. Conditions of a gravitationally bound O(+) plasma were also considered. It was found that if H(+) is a major ion, the H(+) density profile in the expansion region is always concave, with a phase-space divided into three regions, i.e., an undisturbed plasma, a rarefaction region, and an expansion region in which ions are accelerated. When the H(+) is a minor ion, the O(+) ions accelerate the H(+) ions, the H(+) phase-space is divided into five regions, and the increased electron temperatures produce enhanced electrostatic potentials and H(+) drifts in the expansion region.

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