Diffusion coefficients for three major ions in the topside ionosphere

Computer Science

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Diffusion Coefficient, Helium Ions, Hydrogen Ions, Ionic Diffusion, Ionospheric Ion Density, Oxygen Ions, Upper Ionosphere, Atmospheric Diffusion, Atmospheric Models, Atmospheric Temperature, Heat Transfer, Ion Temperature, Polar Regions, Temperature Profiles

Scientific paper

Published experimental data on ion composition in the topside ionosphere are examined. For certain features (the light ion trough, the high-latitude trough, the high-latitude hole and the mid-latitude total ion concentration trough) it is pointed out that the number of major ions present may be three or more. Transport equations derived by Schunk et al. (1975, 1977, 1979) are extended to include the case of the three major ions in the topside ionosphere. Specific calculations are made for the O(+), H(+) and He(+) ions and the behavior of the diffusion coefficients is discussed. From a model of the high-latitude ionization hole, described by Heelis et al. (1981), representative concentration and temperature profiles are obtained. These profiles are used to demonstrate further the behavior of the ion diffusion coefficients.

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