Seasonal variation of upper-atmospheric emission in the atomic oxygen 558 nm line

摘要

Upper-atmospheric airglow observations were used to investigate the seasonal variation of upper-atmospheric emission in the atomic oxygen 558 nm [OI] line over the region of East Siberia (52°N, 103°E). There is a qualitative agreement with the seasonal variations of 558 nm emission obtained in preceding decades at other mid-latitude stations, as well as with model approximations. Quantitative differences of the seasonal variation of 558 nm emission for the region of East Siberia are considered, which imply a more pronounced autumn maximum and larger values of monthly mean 558 nm emission intensities in the winter months (December-January). An analysis of the factors and phenomena that are responsible for the seasonal variation of 558 nm emission, and a comparison with the wind regime dynamics of the upper mesosphere - lower thermosphere as well as with stratospheric warmings in the region of East Siberia suggests the existence regional (longitudinal) features in the seasonal variation of 558 nm emission.