Physics
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992adspr..12...85r&link_type=abstract
(The earth's middle and upper atmosphere; Proceedings of the Topical Meeting of the Interdisciplinary Scientific Commission C /M
Physics
2
Atmospheric Tides, Maximum Entropy Method, Mesosphere, Polar Regions, Radar Measurement, Very High Frequencies, Zonal Flow (Meteorology), Atmospheric Circulation, Fourier Transformation, Spectral Methods, Wave Interaction, Wind (Meteorology)
Scientific paper
VHF radar observations at mesospheric heights have been made during the MAC/SINE campaign in summer 1987 in Northern Norway. For a period of 32 days one hour average of mesospheric velocities within the height range from about 80 to 90 km are derived and analyzed using various spectral methods. The mean zonal winds clearly reveal a strong summer westward circulation of up to 40 m/s. The meridional flow, being smaller (about 10 m/s), is directed equatorwards. Tidal motions mainly consist of the dominant semidiurnal and the weaker diurnal tide with amplitudes of about 15 m/s and 10 m/s, respectively, but show a relatively strong temporal variability. Using the maximum entropy method variations with periods of about 2 d and 16 h are also observed. Bispectral analysis indicates wave-wave interaction.
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