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Long-term observations of total nightglow intensity of the atomic oxygen red630.0 nm line at Abastumani (41.75° N, 42.82° E) in 1957–1993 andmeasurements of the ionosphere F2 layer parameters from the Tbilisiionosphere station (41.65° N, 44.75° E) in 1963–1986 have beenanalyzed. It is shown that a decrease in the long-term trend of the meanannual red 630.0 nm line intensity from the pre-midnight value (+0.770±1.045 R/year)to its minimum negative value (−1.080±0.670 R/year) at the midnight/after midnight is a possible result of the observedlowering of the peak height of the ionosphere F2 layer electron density<I>hm</I>F2 (−0.455±0.343 km/year). A theoretical simulation is carried out usinga simple Chapman-type layer (damping in time) for the height distribution ofthe F2 layer electron density. The estimated values of the lowering in the<I>hm</I>F2, the increase in the red line intensity at pre-midnight and its decrease atmidnight/after midnight are close to their observational ones, when anegative trend in the total neutral density of the upper atmosphere and anincrease in the mean northward wind (or its possible consequence – adecrease in the southward one) are assumed

Different long-term trends of the oxygen red 630.0 nm line nightglow intensity as the result of lowering the ionosphere F2 layer