Abstract
In this paper we report the foF2 data measured at Korhogo station (Lat. 9.3° N; Long. 354.6° E; dip. 0.6° S) compared to predictions with IRI-2012 subroutine URSI and CCIR for different solar cycle phases (minimum, ascending, maximum, descending) and different geomagnetic activity classes (quiet, fluctuating, recurrent, shock). According to our investigations, predictions with IRI are in agreement with the measured data during daytime and show significant differences between them at night-time and especially before sunrise. Except at solar minimum, the gap between predictions and measured data are more appreciable during recurrent and shock conditions compared to quiet and fluctuating conditions. Our results also show that only URSI model expresses the signature of EXB drift phenomenon at solar maximum phase during the recurrent days and at ascending phase for fluctuating activity.
Highlights
International Reference Ionosphere (IRI) is a project jointly created by the Committee on Space Research (COSPAR) and the Union of Radio Sciences International (URSI) in the late1960s
The results of this study revealed that during quiet activity, IRI-2007 predictions were better at solar minimum than at solar maximum
May previous works argue that for equatorial regions frequency of F2 layer (foF2) diurnal profiles lead to the nature and intensity of electric currents in the E region [18,19,20]
Summary
International Reference Ionosphere (IRI) is a project jointly created by the Committee on Space Research (COSPAR) and the Union of Radio Sciences International (URSI) in the late1960s. International Reference Ionosphere (IRI) is a project jointly created by the Committee on Space Research (COSPAR) and the Union of Radio Sciences International (URSI) in the late. The IRI model through its several versions have generated many ionospheric parameters including the critical frequency of F2 layer (foF2) [1]. Many previous studies had made comparisons between ionosonde measured data and IRI model predictions. Some of them [2] compared the foF2 data from the Grahamstown station For West African sector [3] IRI-2007 foF2 predictions were compared to data from Ouagadougou ionosonde (Lat: 12.4° N, Long: 358.5° E, Dip: 1.4° N) during quiet activity days. The results of this study revealed that during quiet activity, IRI-2007 predictions were better at solar minimum than at solar maximum. The same study was carried out in [4] with
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