Features of seasonal [OI] 557.7 nm emission variations
A.V. Mikhalev
Institute of Solar-Terrestrial Physics of the Siberian Branch of the RAS, 664033, Irkutsk, 126a, Lermontova str.
Keywords: свечение атмосферы, эмиссия 557,7 нм, сезонный ход, солнечная активность, airglow, 557.7 nm emission, seasonal variations, solar activity
Abstract
From long-term observations of the upper atmosphere emission in Eastern Siberia, we studied features of seasonal [OI] 557.7 nm emission variations. We found qualitative similarity with seasonal 557.7 nm emission variations obtained from other mid-latitude stations in the Northern hemisphere in previous decades. Among differences are less pronounced annual summer maximum and significantly lower values of 557.7 nm emission intensity in April and the next three months. We found significant correlation coefficients between the monthly averages of 557.7 nm emission intensity and F10.7 solar radio flux index only for autumn and winter months. We discussed possible reasons and mechanisms of the observed 557.7 nm emission variations. We used observations from the Geophysical Observatory of Institute of Solar-Terrestrial Physics SB RAS (52° N, 103° E) for 1997-2016.
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