Abstract
Diurnal variations of the maximum electron concentrations N m F1 and N m F2, the peak height h m F2 and the semi thickness of a parabolic approximation to the F2 -layer maximum Y m F2 were calculated in order to investigate the influence of O + 2 and NO + ions on the structure of the midlatitude F-region. These calculations involve simultaneous solutions of the time-dependent coupled continuity equations for the ions O +, O + 2 and NO + and the equations of motion for the north—south and west-east neutral wind velocities. In order to take into account the F2-layer seasonal anomaly a particular seasonal change of the neutral gas composition was assumed. It is shown that for the molecular ions transport processes can be neglected. Results are given which show the influence of molecular ions on the F2 -layer parameters. The calculated results are compared with observational data deduced from ionograms.
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