The International Reference Ionosphere 1990 (IRI-90) is described. IRI described monthly averages of the electron density, electron temperature, ion temperature, and ion composition in the altitude range from 50 to 1000 km for magnetically quiet conditions in the non-auroral ionosphere. The most important improvements and new developments are summarized. Bilitza, Dieter and Rawer, K. and Bossy, L. and Kutiev, I. and Oyama, K.-I. and Leitinger, R. and Kazimirovsky, E. ELECTRON ENERGY; ION TEMPERATURE; IONOSPHERIC COMPOSITION; IONOSPHERIC ELECTRON DENSITY; REFERENCE ATMOSPHERES; F REGION; RADIO ASTRONOMY; SOLAR ACTIVITY...
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