Indications of a quasi-20-year cycle of middle atmosphere temperatures |
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| Institution: | 1. Space Weather Monitoring Center, Physics Dept., Faculty of Science, Helwan University, Cairo, Egypt;2. Canadian International College in Cairo, Cairo, Egypt;3. National Institute of Geophysics and Volcanology, Rome, Italy;4. United Nations African Regional Centre for Space Science and Technology Education – English (UN-ARCSSTE-E), Obafemi Awolowo University Campus, Ile Ife, Nigeria;5. Physics Dept., Faculty of Science, Helwan University, Cairo, Egypt;6. Department of Space Environment, Institute of Basic and Applied Science, Egypt Japan University of Science and Technology, Alexandria, Egypt;1. Department of Physics, Eko University of Medicine and Health Sciences, Ijanikin, Lagos, Nigeria;2. Department of Physics, Lagos State University, Ojo, Lagos, Nigeria;3. Department of Electronics and Communication Engineering, K L Deemed to be University, Koneru Lakshmaiah Education Foundation, Vaddeswaram, Guntur 522302, India;4. Department of Electrical Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Prince of Chumphon Campus, Chumphon 86160, Thailand;5. Mechanical Engineering Department, College of Engineering, King Saud University, Riyadh 11451, Saudi Arabia;6. GRASP, Physics Department, University of Liege, Liege 4000, Belgium;1. Institute of Atmpospheric Physics, Czech Academy of Sciences, Prague, Czechia;2. Department of Physics, College of Natural and Computational Sciences, Debre Tabor University, Ethiopia |
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| Abstract: | A homogeneous series of 25 years, 1959–1983, of daily measurements of low-frequency radio wave reflection heights in the lower ionosphere (around 80 km), at constant zenith distance of the Sun, has been analysed. After removing the 11-yr solar cycle variation from these data by means of empirical regression coefficients with the solar activity index, F10.7, a significant residual variation remains with a maximum in 1965 and a minimum in 1975. This residual can be interpreted in terms of a corresponding non-solar variation of neutral air pressure at 80 km, thus indicating that recent climatic temperature changes in the middle atmosphere are of quasi-cyclic character rather than a monotonous trend. |
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