Abstract
Electron concentration profiles obtained from the 630 nm nightglow in the ionosphere were compared with independent data of ground-based and satellites observations, and with ionospheric models. It is shown that after due calibration of the F2 layer peak density the observed latitudinal variations of electron concentration and peak height allow to improve the now available maps of the peak parameters. The relative shape of the F region sub-peak electron concentration profile is consistent with other observational data so that nightglow data can be used to improve the International Reference Ionosphere, IRI.
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