Mesospheric winds from lidar observations of atmospheric sodium

Details Mesospheric winds from lidar observations of atmospheric sodium Mesospheric winds from lidar observations of atmospheric sodium

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86..868c&link_type=abstract

Journal of Geophysical Research, vol. 86, Feb. 1, 1981, p. 868-870. Financiadora de Estudos e Projetos

Physics

12

Mesosphere, Optical Radar, Sodium Vapor, Wind Velocity Measurement, Winds Aloft, Cross Correlation, Density Distribution, Night Sky, Time Lag, Vertical Distribution

Scientific paper

Laser radar observations of the atmospheric sodium layer, made by various groups of workers during the past decade, have shown that the layer exhibits considerable time-varying structure. This paper describes horizontally spaced measurements of this structure and uses the results of these observations to derive horizontal velocities in the height range 82 to 99 km. The measurements were made with a steerable lidar operating at a fixed zenith angle of 20.9 deg and pointed at each of three azimuths in turn, the complete sequence taking 5 min. The analysis of a 10-hour data run taken on the night of July 21, 1979, is presented. A cross correlation analysis was carried out for each of the height intervals in the range 82 to 99 km. The velocities calculated from the derived time shifts were found to vary with height in an oscillatory manner, with amplitude increasing with height. The east-west component showed a vertical wavelength of approximately 10 km, the north-south component a wavelength of 5 km, and the magnitude of the velocity varied between 6 and 146 m/s.

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