A modelling study of the post-sunset formation of plasma temperature troughs in the equatorial topside ionosphere

Details A modelling study of the post-sunset formation of plasma temperature troughs in the equatorial topside ionosphere A modelling study of the post-sunset formation of plasma temperature troughs in the equatorial topside ionosphere

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986angeo...4..113b&link_type=abstract

Annales Geophysicae, Series A - Upper Atmosphere and Space Sciences, vol. 4, April 1986, p. 113-129.

Physics

Atmospheric Models, Equatorial Atmosphere, F Region, Night Sky, Plasma Temperature, Temperature Distribution, Atmospheric Circulation, Hydrogen Atoms, Sunspots

Scientific paper

A mathematical model is developed to calculate values for the O(+), H(+) and He(+) concentrations and field-aligned velocities for the O(+), H(+) and electron temperature at equatorial latitudes during the post-sunset period. Data indicate that for about 90 minutes after sunset the ion field-aligned velocities are directed poleward in both hemispheres, with the meridional neutral air wind blowing from the summer to winter hemisphere, and that after 90 minutes the field-aligned velocities become directed from the summer to the winter hemisphere in both hemispheres. The ion field-aligned velocities and the depth of the plasma troughs are found to be extremely sensitive to the neutral atomic hydrogen concentration. Data indicate that the sunspot maximum concentrations of neutral hydrogen in the topside ionosphere at equatorial latitudes derived by Hedin (1983) are too low by a factor of 2.

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