Diurnal Variation of Surface Radio Refractivity Over Three Meteorological Stations in Nigeria

Gabriel Adisa Adegboyega, Temitope Sadiq


Analysis and study of the vertical variation of refractivity in the troposphere is required for radio systems planning in order to achieve successful operation. The diurnal variation of surface radio refractivity over three meteorological stations in Nigeria is presented. The stations include Lagos-Ikeja (6⁰35’N, 3⁰40’E), Akure (7⁰15’09”N, 5⁰11’35”E) and Minna (9⁰37’N, 6⁰32’E). Monthly mean values of temperature, pressure and relative humidity were used to compute refractivity for three stations. The surface refractivity also shows latitudinal and seasonal variation. The maximum refractivity values were obtained for Ikeja (Lagos) of 394 N-units, Akure of 404 N-units and Minna of 364 N-units.


Refractivity, Refractive Index, radio wave propagation

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Ajayi G.O. (1989), Physics of the Troposphere Radio Propagation; A Proceeding of the ICTP College on Theoretical and Experimental Radio Propagation Physics, Trieste, Italy, pp. 6-24.

Bean, B.R. and Dutton, E.J. (1968), Radio Meteorology, 1-20, Dover Edition, New York, USA.

Bean, B.R. and Dutton, E.J. (1966), Radio Meteorology, US Department of Commerce, National Bureau of Standards Monograph 92.

Hall, M.P.M. (1979) Effects of the Troposphere on Radio Communications, 14-46, IEEE Peter Pergrinus Ltd. London and New York.

ITU-R (2003) The Radio Refractive Index. Its Formula and Refractivity Data, pp. 453-459.

Lane, J.A. and Bean, B.R. (1963) A radio Meteorological Study, Part 1. Existing Radio Meteorological Parameters; Part II; An Analysis of VHF Field Strength Variations and Refractive Index Profiles; Part III. A New Turbulence Paramenter J.Res. Natl. Bur. Std, Vol 67, pp. 589-604.

DOI: http://dx.doi.org/10.22385/jctecs.v6i0.104