Response of the lower thermosphere temperature on the winter warming of the stratosphere

Details Response of the lower thermosphere temperature on the winter warming of the stratosphere Response of the lower thermosphere temperature on the winter warming of the stratosphere

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5397..212i&link_type=abstract

Tenth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics. Part II: Laser Sensing and Atmospheric

Physics

Optics

Scientific paper

The measurements of temperature of the lower thermosphere and mesopause were made with a Fabry-Perot spectrometer (FPS) on nightglow green line emission of oxygen 557.7 nm at Maimaga optical range near Yakutsk (geogr. 63 N, 129.7 E), since 1999 up to 2003. Piezoelectrically scanning FPS had the aperture of 140 mm, instrumental width 0.0015 nm and free spectral interval 0.0104 nm for emission 557.7 nm. Till December 2002 observations were conducted in moonless nights since December till April, and since December 2002 till the present time without interruption on lunar period. From consideration the periods with auroras were eliminated. The relationships between the lower thermosphere temperature variations and winter stratospheric warmings are considered. The arrangement of the majority of the centers of winter stratosphere warmings above our locale gives a unique capability of research of the lower thermosphere temperature variations during these warmings. It is showed that in cases of downward warming propagation the lower thermosphere temperature also increased. In cases of upward stratospheric warming propagation the lower thermosphere is cooled because of this infrared radiation. A reason of these variations in our opinion in planetary waves generated in a troposphere. The stratospheric temperature data are obtained from NOAA data set for several levels and allows to track vertical and horizontal dynamics of the warming.

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