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.
Indications of a quasi-20-year cycle of middle atmosphere temperatures
Advances in Space Research ; 6 , 10 ; 73-75
1986-01-01
3 pages
Article (Journal)
Electronic Resource
English
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