Chaotic characteristics of microwave radio field strength over Nigeria

Abstract

This paper accesses the dynamics of microwave radio field strength over selected stations in Nigeria by computing radio refractivity and its field strength on the basis of sets of measured atmospheric parameters. Hence, radio refractivity and field strength is computed from meteorological variables across seven locations ((Akure (7.0°N, 4.6°E), Anyigba (9.1°N, 7.4°E), Jos (10.7°N, 9.0°E), Minna (9.6°N, 6.4°E), Nsukka (6.9°N, 7.4°E), Port-Harcourt (4.7°N, 7.0°E), Yola (9.3°N, 12.3°E)) in Nigeria for two-years (January 2011 – December 2012). The results in this paper depends on Tropospheric Data Acquisition Network (TRODAN) data compiled and administered by the Centre for Atmospheric Research, National Space Research and Development Agency, Anyigba, Kogi State, Nigeria. The degree of chaoticity across the study locations, varying from rainy season to dry season have been quantified. Analysis of the computed radio field strength time series is based on nonlinear techniques which include the Phase Space Reconstruction (PPR), Average Mutual Information (AMI), False Nearest Neighbour (FNN), Lyapunov exponent (LE) and Tsallis entropy (TE).