Abstract
The amount of measured temperature data accumulated in recent years allows and asks for improvement and refinement of the rather crude temperature models employed in the International Reference Ionosphere 1979. By combining the mission-oriented models by BRACE, THEIS /2/ for the AE-C satellites and by SPENNER, PLUGGE /1/ for the AEROS-A satellite, a much better diurnal and latitudinal reliability can be obtained. It is also suggested that IRI should have the option to make use of the strong anti-correlation between electron temperature and density in cases where actual measured densities are available. For daytime condition, incorporation of a density dependent model into IRI can significantly enhance the prediction quality of IRI in the altitude range 300 to 600 km. Furtheron, the solar activity dependence of the electron temperature and of the density-temperature-relation are investigated by comparing the low solar activity models with more recent AE-C and -DE data.
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