QUARTERLY VARIATION OF TROPOSPHERIC SURFACE REFRACTIVITY IN ILORIN, NIGERIA
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Abstract
To construct a radio communication system, there is need for extensive knowledge of the refractivity and its variations. This work aims to determine the change in season with tropospheric surface refractivity of Ilorin, Kwara, Nigeria. The refractivity for both dry (1st quarter) and rainy (3rd quarter) seasons for 2000 - 2002 have been calculated using the meteorological data obtained from the Nigerian Meteorological Agency, Ilorin. The result shows that there is a variation between tropospheric surface refractivity during the dry and rainy seasons. High refractivity during the rainy season than in dry season is observed, mainly due to higher amount of water content in the atmosphere (troposphere) in the rainy season.
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Licensee MJS, Universiti Malaya, Malaysia. This article is an open-access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
References
Abimbola, O. J., Bada, E., Falaiye, A. O., Sukam, Y. M., & Muhammad, S. (2021). Estimation of radio refractivity from a decade of satellite-derived meteorological data for West Africa. Scientific African, 14. https://doi.org/10.1016/j.sciaf.2021.e01054.
Adedeji, A. T., & Ajewole, M. O. (2008). Vertical profile of radio refractivity gradient in Akure, Southwest Nigeria. Progress in Electromagnetic Research C, 4, 157–168.
Adediji, A. T., Ajewole, M. O., Ojo, J. S., Ashidi, A. G., Ismail, M., & Mandeep, J. S. (2013). Influence of some meteorological factors on tropospheric radio refractivity over a tropical location in Nigeria. Journal of Atmospheric and Solar-Terrestrial Physics, 125–127.
Adeyemi, B. (2004). Tropospheric radio refractivity over three radiosonde stations in Nigeria. Ife Journal of Science, 6(2), 167–176.
Agbo, G. A., Okoro, O. N., & Amechi, A. O. (2013). Atmospheric refractivity over Abuja, Nigeria. International Research Journal of Pure and Applied Physics, 1(1), 37–45.
Ali, S., Malik, S. A., Alimgeer, K. S., Khan, K. S., & Ali, R. L. (2011). Statistical estimation of tropospheric radio refractivity derived from ten years meteorological data. Journal of Atmospheric and Solar-Terrestrial Physics, 77, 96–103.
Bawa, M., Ayantunji, B. G., Mai-Unguwa, H., Galadanchi, G. S. M., & Shamsuddeen, I. M. (2015). Study of average hourly variations of radio refractivity variations across some selected cities in Nigeria. IOSR Journal of Applied Physics (IOSRJAP), 7(6), 37–43.
Bean, B. R., & Horn, J. D. (1959). Radio refractive index of climate near the ground. Journal of Research of the National Bureau of Standards, Section D: Radio Propagation, 63D(3).
Bean, B. R. (1966). Radio meteorology. New York, USA.
Daniel E. O., Amajama, J., & Mfon, O. C. (2015). Observing the radio refractivity pattern variation during the dry season in Calabar, Nigeria. International Journal of Scientific Research Engineering and Technology (IJSRET), 4.
Edet, C. O., Eno, E. E., & Ettah, E. B. (2017). Monthly variation of radio refractivity in Calabar, Nigeria. International Journal of Scientific Research Engineering and Technology (IJSRET), 6(4), 315–317.
Ekpe, O. E., Agbo, G. A., Ayantunji, B. G., Yusuf, N., & Onugwu, A. C. (2010). Variation of tropospheric surface refractivity at Nsukka in the southeastern Nigeria. Nigeria Journal of Space Research, 7, 42–48.
Falaiye, O. A, Abimbola, O. J., & Akinyanyu, D. J. (2016). Spacio-temporal variation of radio refractivity in Lafia, Nasarawa State using CM SAF ATOVS satellite data. Fulafia Journal of Science and Technology, 2(1), 111–119.
Falodun, S. E., & Ajewole, M. O. (2006). Radio refractive index in the lowest region (100 m) of the troposphere in Akure. South-Western Journal of Atmospheric and Solar-Terrestrial Physics, 68, 236–243.
Hall, M. P. (1979). Effects of the troposphere on radio communication. Institute of Electrical Engineers, 1–22.
Hughes, K. A. (1998). Radio propagation data from tropical regions: A brief review of a seminar on radio propagation in tropical regions. [Unpublished notes from a lecture presented at the Centre for Theoretical Physics.]
Igwe, K. C, Adimula, I. A., Falaiye, O. A., & Oyedum, O. D. (2011). Radio refractive index variations with related weather parameters at surface level in Ilorin, North Central Nigeria. IUP Journal of Physics, 4(3), 57–66.
Igwe, K. C., & Adimula, I. A. (2009). Variations of surface radio refractivity and radio refractive index gradients in the Sub-Sahel. Nigerian Journal of Space Research, 6, 135–144.
Ikeh, U. C., & Okeke, C. C. (2016). The study of surface radio refractivity in Awka, South Eastern Nigeria. Journal of Geography, Environment and Earth Science International, 6(2), 3–7.
Korak Shaha, P. (2003). The physics of the earth and its atmosphere. John Wiley & Sons.
Okoro, O. N., & Agbo, G. A. (2012). The effect of variation of meteorological parameters on the tropospheric radio refractivity for Minna. Global Journal of Science Frontier Research Physics and Space Science, 12(2), 4–6.
Thayer, G. D. (1974). An improved equation for radio refractive index of air. Radio Science, 9(10), 803–807.
Ukhurebor, K. E., & Nwankwo, W. (2020). Estimation of the refractivity gradient from measured essential climate variables in Iyamho-Auchi, Edo State, South-South Region of Nigeria. Indonesian Journal of Electrical Engineering and Computer Science, 19(1), 276–284.
Ukhurebor, K. E., & Azi, S. O. (2019). Review of methodology to obtain parameters for radio wave propagation at low latitudes from meteorological data: New results for Auchi area in Edo State, Nigeria. Journal of King Saud University of Science, 31(4), 1445–1451. https://doi.org/10.1016/j.jksus.2018.03.010
Ukhurebor, K. E., Azi, S. O., Abiodun, I. C., & Ojiemudia, S. E. (2018). Influence of weather variables on atmospheric refractivity over Auchi Town, Edo State, Nigeria. Journal of Applied Science and Environment Management, 22(4), 471–475.
Willoughby, A. A., Aro, T. O., & Owotabi, I. E. (2002). Seasonal variations of radio refractivity gradients in Nigeria. Journal of Atmospheric and Solar–Terrestrial Physics, 64, 417–425.