Abstract A study on the variability of the equatorial ionospheric electron density was carried out at fixed heights below the F2 peak using one month data for each of high and low solar activity periods. The data used for this study were obtained from ionograms recorded at Ilorin, Nigeria, and the study covers height range from 100km to the peak of the F2 layer for the daytime hours and height range from 200km to the peak of the F2 layer for the nighttime hours. The results showed that the deviation of the electron density variation from simple Chapman variation begins from an altitude of about 200km for the two months investigated. Daytime minimum variability of between 2.7% and 9.0% was observed at the height range of about 160 and 200km during low solar activity (January 2006) and between 3.7% and 7.8% at the height range of 210 and 260km during high solar activity (January 2002). The nighttime maximum variability was observed at the height range of 210 and 240km at low solar activity and at the height range of 200 and 240km at high solar activity. A validation of IRI-2007 model electron density profile’s prediction was also carried out. The results showed that B0 option gives a better prediction around the noontime.
Variability of the ionospheric electron density at fixed heights and validation of IRI-2007 profile’s prediction at Ilorin
Advances in Space Research ; 47 , 3 ; 496-505
2010-09-21
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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