Ion temperature troughs induced by a meridional neutral air wind in the night-time equatorial topside ionosphere

Mathematics

Scientific paper

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Equatorial Atmosphere, F Region, Ion Temperature, Mathematical Models, Meridional Flow, Neutral Gases, Night Sky, Electron Energy, Hydrogen Ions, Ion Production Rates, Ionospheric Ion Density, Oxygen Ions, Temperature Distribution, Wind Velocity

Scientific paper

A mathematical model was constructed to calculate O(+) and H(+) concentrations, field-aligned velocities, and electron temperatures in the night-time equatorial topside ionosphere. The model is used to establish the ability of F-region neutral air winds to produce observed ion temperature distributions, and to study the properties of ion temperature troughs as functions of altitude, latitude, and ionospheric composition. The O(+) - H (+) transition height represents an altitude limit above which the ion cooling from adiabatic expansion of the plasma is very small; the northern and southern edges of the ion temperature troughs are restricted to the limiting dip altitudes determined by magnetic field line geometry and by the functional form of the F-region neutral wind velocity.

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