Physics
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jatp...47..499f&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 47, May 1985, p. 499-512. Sponsorship: Deutsche Forschungs
Physics
86
Atmospheric Temperature, Hyperfine Structure, Mesopause, Radar Measurement, Resonance Lines, Sodium, Atomic Energy Levels, D Lines, Optical Radar, Scattering Cross Sections, Temperature Measurement
Scientific paper
In the 80-100 km altitude region, free sodium atoms are abundant enough to allow the probing of the Doppler-widened hyperfine structure (hfs) of the D2 resonance transition by ground-based lidar and hence to deduce atmospheric temperatures. The dependence of the observed shape of the hfs on the temperature, on geographic location and on polarization of the lidar, on differential extinction, and on the bandwidth of the lidar transmitter is discussed. The results are applied to new measurements of the mesopause sodium hfs structure obtained by the University of Bonn lidar.
Fricke Karl-Heinrich
von Zahn Ulf
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