The quiet night ionosphere - Comparison of calculated and measured decay rates

Physics

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F 2 Region, Ion Recombination, Ionospheric Composition, Night Sky, Plasma Decay, Charge Exchange, Midlatitude Atmosphere, Neutral Gases, Proton Flux Density, Reaction Kinetics, Thermal Plasmas

Scientific paper

The slow decay of the total content of the quiet night ionosphere at a mid-latitude station is shown to be satisfactorily explained by the measured increase in the height of the layer after sunset together with a small flux (less than or approximately equal to 10 to the 12th/sq m) of thermal plasma from the protonosphere deduced from experimentally measured quantities. The ionospheric recombination rate found here is in good agreement with the published laboratory rates of the two principal recombination reactions. For the four nights under study, use is made of the total content from Faraday rotation, sub-peak electron density versus height profiles from a ground based ionosonde, and protonospheric plasma densities and electric fields from whistler measurements. The simultaneous electric fields are used to show that they are not a very significant factor in maintaining the F2-layer during the quiet times reported here.

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