Quantitative characteristics of long-term changes in parameters of the upper atmosphere of the earth over the 1966–1992 period

On the basis of the long series of mass-spectrometer measurements conducted in rocket experiments during 1966–1992 period, long-term changes in the structural parameters of the upper atmosphere within the 100–160 km height interval at equatorial, middle, and high latitudes of the Northern Hemisphere of the Earth are quantitatively estimated. At all latitudes statistically significant negative trends are revealed in the turbopause height, temperature of the neutral atmosphere, and atomic oxygen concentration. Since the contribution to the obtained quantitative estimates of the trends caused by long-term solar-induced factors does not exceed 15–20%, a conclusion is drawn on the anthropogenic nature of the changes having occurred in the upper atmosphere.