Dynamics of vertical profile of radio refractivity in Akure, South-Western Nigeria
 /  Dynamics of vertical profile of radio refractivity in Akure, South-Western Nigeria

Dynamics of vertical profile of radio refractivity in Akure, South-Western Nigeria

S. T. Ogunjo , I. A. Fuwape, S. S. Oluyamo, A. B. Rabiu, B. J. Dada

Abstract
This research investigated fractal and chaotic dynamics in the vertical profile radio refractivity in the atmosphere using Tsallis Entropy, Hurst Exponent and Largest Lyapunov Exponent (LLE). Daily temperature, relative humidity and radio refractivity data obtained from the  European Centre for Medium Range Weather Forecasts (ECMWF) Re-Analysis Project at thirty seven (37) different atmospheric pressure level from 1979 – 2014 were used in this study. The Hurst Exponent parameter obtained, using the method of Detrended Fluctuation Analysis, in the radio refractivity profile studied showed that there is persistence across all levels. Tsallis entropy did not reveal any structure or  significant variations from the tropopause to the surface. To determine if any of the radio refractivity is chaotic at any of the studied level, the Largest Lyapunov Exponent (LLE) was computed. Positive values were obtained at all levels for radio refractivity, indicating deterministic  chaos in the profile of radio refractivity.

Journal Article
PDF, 137.2 KB
Creative Commons LicenseCreative Commons license
Physical Sciences
Physics
chaos, radio refractivity, Lyapunov Exponent, atmospheric dynamics
Christian Bassey
17th April, 2018
17th April, 2018
http://oer.mciu.edu.ng/wp-content/uploads/2015/04/73-Prof-fuwape.pdf


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