Abstract
The effect of anomalously high average nighttime intensities of the atomic oxygen 557.7-nm atmospheric emission (luminescence heights 85–115 km) during sudden winter stratospheric warming events (SWEs) in Eastern Siberia is considered. Analysis of the variations in the 557.7-nm emission intensity (I557.7) revealed the interdaily I557.7-nm variations during SWEs and high average monthly I557.7-nm values in the winter months in conditions of high solar activity. It has finally been found that the variations with periods of several days, at a maximum of which anomalously high daily values of I557.7 are observed, are superposed on the average I557.7-level during SWEs at high solar activity. A high average level of I557.7 in the winter months in Eastern Siberia can be related to the fact that the atomic oxygen concentration at altitudes of the 557.7 nm emission luminescence increases by a factor of 2–3 in years of high solar activity.
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