Some peculiarities of long-term variations of the earth’s upper atmosphere radiation in connection with changes in atmosphere-ocean climatic system

We analyze long-term variations of the Earth’s upper atmosphere radiation in 557.7 nm spectral line of atomic oxygen as well as changes in atmosphere-ocean climatic system. For 557.7 nm emission we used published observational data from midlatitude stations (solar cycles 18-22) and data (solar cycle 23) from the Geophysical Observatory if the Institute of Solar-Terrestrial Physics SB RAS. For the atmosphere-ocean system indices of El Nino Southern Oscillation (ENSO) are used. It has been found that when values of some ENSO indices, for example Oceanic Nino Index (ONI) are extremely low for a long time then the depression of 557.7 nm emission intensity is noticeable. For the cases of events corresponding to years close to solar minima (1954-1956 и 1973-1975) abnormally low average annual values of 557.7 nm emission intensity were observed. For the cycle 23 solar maximum (2000-2002), at low ONI indices the depression of 557.7 nm emission intensity is noticeable. This depression results in disruption of the direct dependence of 557.7 nm emission intensity on the solar activity level. The results allow us to preliminary conclude that long-standing and inter-annual variations of 557.7 nm emission intensity may be caused by the combined effect of the solar activity and oscillations of the atmosphere-ocean climatic system on the Earth’s upper atmosphere emission.