Physics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992angeo..10..887y&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 10, no. 11-12, p. 887-894.
Physics
11
Atmospheric Physics, Gravity Waves, Mesopause, Polar Regions, Radar Echoes, Summer, Energy Dissipation, Meridional Flow
Scientific paper
Observations with the mobile SOUSY VHF Radar in the polar mesopause region during the summer of 1987 show quasi-monochromatic internal gravity waves which have decreasing apparent vertical wavelengths and suddenly decay when they propagate into regions of increasing background wind. A data analysis based on the dispersion relation under Bousinesq and WKB approximations indicates that the horizontal phase trace velocities match the background wind at heights close to the local maxima of the echo intensity profiles. There is evidence for a correlation between the wave energy density at the lower edge of the radar echo layer and the maximum echo intensity. It is suggested that the internal gravity waves give rise to statically unstable density structures producing enhanced radar signals in the bottom side of the echo layer.
Klostermeyer Juergen
Ruester Ruediger
Yi Feng
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