The [OI] 557.7-nm Airglow Emission during El Niño/La Niña Extreme Events in Solar Cycles 23–24

Abstract

Variations in airglow in the 555.7 nm atomic oxygen line and the ONI index of the El Niño Southern Oscillation (ENSO) phenomenon in 1997–2017 are analyzed. A correlation between these parameters is revealed. During the prolonged La Niña episode of 1999–2001, the 557.7-nm emission depression was observed, whereas in the extreme El Niño episode of 2015–2016, the 557.7-nm emission increased. A possible effect of the ENSO phenomenon on the airglow is considered. A tentative conclusion is drawn that longterm and interannual variations in the 557.7-nm emission intensity can result from the joint effect of solar activity and changes in the global atmospheric circulation.