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Radio refractivity, which is the bending of radio signal as it propagatesthrough media, is very important in works involving terrestrial atmosphericelectromagnetic propagation such as point-to-point microwave communication,terrestrial radio and television broadcast, mobile communication system, and soon. This study has focused on the West African region where it was found thatthe region has a refractivity which varies exponentially with height and fromthe coast towards the desert. Generally, refractivity gradient was found torange between -46.48 and -29.51 N-units/km (k-factor value of between 1.23 and1.42) across the region, splitting the between sub- and super-refraction. Thevariation in refraction type was found to follow seasonal pattern across theWest African region, with sub-refraction dominating during dry season andsuper-refraction dominating most part in the coastal area during the wetseason.

Estimation of Radio Refractivity from a Decade Satellite Derived Meteorological Data for West Africa