Physics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..809k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 8, April 24, 1992, p. 809-812.
Physics
7
Atmospheric Temperature, Middle Atmosphere, Optical Radar, Solar Terrestrial Interactions, Twenty-Seven Day Variation, Solar Activity Effects, Solar Radiation, Ultraviolet Radiation
Scientific paper
The response of the middle atmosphere temperature to short term solar UV radiation related to the 27-day period of the sun has been studied by Rayleigh lidar at midlatitude in the height range 30-90 km. Amaong the 9 sequences, each of 3 to 4 months duration, which corresponds to clear solar signature, two types of behavior have been found: either the temperature response is positively correlated with the solar UV flux in the whole height range, or the response reverses abruptly from positive to negative within the height interval 40-60 km. It is important to notice that this second type of behavior is observed as well in summer or in winter, i.e., even in the absence of planetary wave activity, but has only been seen during the Westward phase of the QBO. If such a change of the temperature is confirmed to be solar induced, this response to change in the UV flux is clearly different from the one observed for the 11-year solar cycle. Therefore the 27-day signature of atmospheric structure should not be used as a proxy for the 11-year variation.
Chanin Marie-Lise
Keckhut Philippe
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