Abstract
Ionosonde data obtained during years of moderate and high solar activity at San Juan (31.5S, 290.4E) are used to study the behaviour of the thickness parameter Bo and the shape parameter B1 at midnight. The experimental monthly mean values of Bo and B1 were compared with those predicted by the IRI-90 model, for different seasonal and solar activity conditions. The study shows that the seasonal trend of the observed mean Bo values is different from those shown by old and new IRI options. The experimental Bo values for the summer and winter solsticies are slightly larger than those observed in the equinoxes. The experimental mean B1 is always less than 3, the value adopted generally by the model. A statistical study has been undertaken in order to check the validity of the Bo values obtained. Further research is needed using a larger data base to assess if it is possible to improve the current nightime IRI formulation.
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