Physics
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989angeo...7..463c&link_type=abstract
Annales Geophysicae (ISSN 0980-8752), vol. 7, Oct. 1989, p. 463-469. Research supported by CNRS.
Physics
26
Atmospheric Temperature, Solar Activity Effects, Solar Oscillations, Solar Terrestrial Interactions, Thermosphere, Planetary Waves, Solar Cycles, Solar Flux, Troposphere
Scientific paper
Published temperature data of the lower thermosphere showing an unexpected relationship with solar cycle have been re-analyzed, by arranging winter data according to the two phases of the Quasi-Biennial Oscillation (QBO), for two sites situated at high- and mid-latitude. It is shown that the observations of positive or negative correlations with the solar flux, alternating with height, as they are seen during winter months from ground level to 30 km by Labitzke and van Loon and up to 80 km by Labitzke and Chanin, are observed as high as 170 km; this leads in the lower thermosphere to an inverse relationship between temperature and solar activity in contradiction with the current models. The growth with altitude of the temperature dependence as a function of the solar flux and the vertical wavelength of the observed structures seem to support the hypothesis that this effect is the result of the upward propagation of planetary waves of tropospheric origin.
Chanin Marie-Lise
Hauchecorne Alain
Keckhut Philippe
Labitzke Karin
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