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This study investigates the effect of primary radio climatic variables on the tropospheric surface radio refractivity across three stations (Makurdi (7.7322° N, 8.5391° E), Jos (9.8965° N, 8.8583° E) and Lagos (6.5244° N, 3.3792° E) in Nigeria. Two years (January 2008-December 2009) primary radio climatic variables data (temperature, pressure and relative humidity) obtained from the archive of the Tropospheric Data Acquisition Network (TRODAN) of the Centre for Atmospheric Research (CAR), which is an activity centre of the Nigeria National Space Research and Development Agency (NASDRA) was used for this study. The measurement was made at 30 minutes interval for a complete 24 hours cycle. The results obtained establish the variation of temperature and relative humidity to refractivity across the region.
Agbo GA, Okoro ON, Amechi AO. Atmospheric refractivity over Abuja, Nigeria. Inter. Res. Journal Pure Appl. Physics. 2013;1(1):37-45.
Ukhurebor KE, Azi SO. Review of methodology to obtain parameters for radio wave propagation at low altitudes from meteorological data: New results for Auchi area in Edo State, Nigeria. J. King Saud University–Sci; 2018.
Martin G, Vaclav K. Atmospheric refraction and propagation in lower troposphere, electromagnetic waves, vitaliy Zhurbenko (Ed.). In Tech. 2011;7:139-156.
Amajama J, Association between atmospheric radio wave refractivity and UHF radio signal strength. American International Journal of Research in Formal, Applied & Natural Sciences. 2016;13(1):61-65.
Adediji AT, Ajewole MO, Falodun SE. Journal of Atmospheric and Solar-Terrestrial Physics Distribution of radio refractivity gradient and effective earth radius factor (k-factor) over Akure, South-Western Nigeria. J. Atmos. Solar-Terrestrial Phys. 2011;73(16):2300–2304.
Okeke PN, Ayantunji BG. Diurnal and seasonal variation of surface. 2011;30: 201–222.
Agbo GA. Troposphere refractivity dependence on atmosphere weather conditions In Jos, Nigeria. Journal Of Physics Research (Nigeria). 2011;1-6.
Adeyemi B, Emmanuel I. Monitoring tropospheric radio refractivity over Nigeria Using CM – SAF Data Derived From NOAA – 15, 16 and 18 Satellites; 2011.
Adediji AT, Mahamod I, Mandeep JS. Performance analysis of microwave radio refractivity on radio field strength and radio horizon distance over Akure, Nigeria. Wireless Personal Communications. 2014; 79:1893 –1909.
Hughes KA. Radiowave propagation data from Tropical regions: A brief review. SMR on Radiowave Propagation in Tropical Regions. Trieste (Italy); 1993.
Zilinskas M, Tamosiunaite M, Tamosiuniene M, Valma E, Tamosiunas S. Gradient of radio refractivity in troposphere. Progress in Electromagnetics Research Symposium Proceedings. 2012;603–607.
Deborah OO, Moradeyo AA. Regional implication of tropospherc surface refractivity on radio propagation (A Case Study of Nigerian Atmosphere). Advances in Applied Science Research. 2013;4:346–349.
ITU-R. The radio refractive index: Its formula and refractivity data. 2012;453-10.
ITU-R. The radio refractive index: Its formula and refractivity data. 2003;453-459.
ITU-R. The radio refractive index: its formula and refractivity data. 2012;453- 10.
Barclay L. “Propagation of Radiowaves”. The Institution of Electrical Engineers, 2nd Edition, London; 2003.
Adediji AT, Mahamod Ismail, Mandeep JS. Incidences of anomalous propagation of microwave radio signals over Akure, Nigeria. Proceeding of the IEEE. International Conference on Space Science and Communication (Icon Space). 2013;102-105.