The [OI] 557.7 nm airglow emission during El NiГ±o/La NiГ±a extreme events in solar cycles 23-24
A.V. Mikhalev
Institute of Solar-Terrestrial Physics of the Siberian Branch of the RAS, 664033, Irkutsk, 126a, Lermontova str
Keywords: излучение верхней атмосферы, эмиссия 557, 7 нм, Эль-Ниньо/Ла-Нинья, airglow, 557.7 nm emission, El Nino/La Nina
Abstract
We examine 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. Correlation between these parameters is revealed. During the prolonged La Niña episode of 1991-2001, the 557.7 nm emission depression was observed, where as in the extreme El Niño episode of 2015-2016, the 557.7 nm emission increased. We discuss possible mechanisms of the ENSO phenomenon effect on the airglow. A tentative conclusion has been made that long-term and interannual intensity variations in the 557.7 nm emission can result from the joint effect of solar activity and changes in the global atmospheric circulation.
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