Physics
Scientific paper
Jul 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jastp..59.1205a&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, v. 59, p. 1205-1208.
Physics
6
Scientific paper
Ionospheric profiles below the F2 peak ionisation density are compared with those of the International Reference Ionosphere (IRI). The data used are those of Ibadan (latitude 7.4° N, longitude 3.9° E). The results show that, at low solar activity, the greatest difference between the model and experimental observations occurred in winter and in the September equinox, when the IRI model gives a thinner bottomside than the observations show. During the summer and March equinox of this solar epoch, the major difference occurs only around the F1 region, where the model gives a lower electron density than is observed experimentally. The difference in summer is not as great as that observed during the March equinox. At high solar activity, the model is close to the observed profile from the F2 peak down to a height around the point where the electron density is half of the F2 peak density (h 0.5). From h 0.5 to the height of the E layer peak, the IRI model gives a lower electron density than is observed experimentally. The discrepancy is smallest during the March equinox season. some suggestions are made for the improvement of the model.
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