Equatorial total electron content (TEC) at low and high solar activity

Total electron content (TEC) derived from ionosonde data recorded at the station of Korhogo (Lat = 9.33°N, Long = 5.43°W, Dip = 0.67°S) are compared to the International Reference Ionosphere (IRI) model predicted TEC for high (1999) and low (1994) solar activity conditions. The results show that the...

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Bibliographic Details
Published in:Advances in space research 2009-06, Vol.43 (11), p.1757-1761
Main Authors: Obrou, O.K., Mene, M.N., Kobea, A.T., Zaka, K.Z.
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Equatorial ionosphere
Exact sciences and technology
External geophysics
foF2
IRI model
Total electron content
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Summary:Total electron content (TEC) derived from ionosonde data recorded at the station of Korhogo (Lat = 9.33°N, Long = 5.43°W, Dip = 0.67°S) are compared to the International Reference Ionosphere (IRI) model predicted TEC for high (1999) and low (1994) solar activity conditions. The results show that the model represents the diurnal variation of the TEC as well as a solar activity and seasonal dependence. This variation is closer to that of the ionosonde-inferred TEC at high solar activity. However, at low solar activity the IRI overestimates the ionosonde-inferred TEC. The relative deviation ΔTEC is more prominent in the equinoctial seasons during nighttime hours where it is as high as 70%. At daytime hours, the relative deviation is estimated to 0–30%.
ISSN:0273-1177
1879-1948
DOI:10.1016/j.asr.2008.04.019