Abstract
The validity of the International Reference Ionosphere 1990 to predict the occurrence of the intermediate F1 layer is checked. Data recorded at two Argentine stations: TUCUMAN and BUENOS AIRES at different seasons and solar activity conditions are used. The number of days in which the layer is present, including L condition, is analyzed. Discrepancies between observations and predictions have been found particularly during winter and in the time range of occurrence of the layer. The need of an extension of this test study to other stations is pointed out in order to improve the DuCharme et al. (1973) formula adopted by the model to predict the occurrence of the F1 layer.
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