Simultaneous lidar measurements of the sodium layer at the Air Force Geophysics Laboratory and the University of Illinois

Details Simultaneous lidar measurements of the sodium layer at the Air Force Geophysics Laboratory and the University of Illinois Simultaneous lidar measurements of the sodium layer at the Air Force Geophysics Laboratory and the University of Illinois

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9112131g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Nov. 1, 1986, p. 12131-12136. USAF-supported research.

Physics

4

Atmospheric Composition, Mesosphere, Optical Radar, Sodium, Wind Velocity

Scientific paper

Simultaneous lidar measurements of the mesospheric sodium layer were made at the AFGL and University of Illinois at Urbana-Champaign (UIUC) on the nights of August 28, October 9 and October 16, 1985. On these nights the layer centroid height was 1 to 3 km lower at AFGL. In October, the altitude of the layer bottomside was near 80 km at AFGL compared to 85 km at UIUC. Gravity wave activity was present in the layer at both sites on all 3 nights. In October, the wave amplitudes were significantly larger at AFGL. The sodium profiles were compared with similar measurements obtained at the Goddard Space Flight Center in October 1981 and at the White Sands Missile Range in October 1984. The data from all four sites indicate that there is a significant longitudinal variation in the layer structure between 70 deg W and 90 deg W. It is suggested that these structural differences may be due to dynamics. The most promising mechanism capable of producing the large 1 to 3 km differences in the layer centroid heights between UIUC and AFGL is a small difference in the mean vertical wind velocity. Because the typical residence time for a sodium atom in the layer is approximately 5.8 days, a 0.4 cm/s difference in the mean vertical wind velocities at the two sites is capable of inducing a 2-km difference in the centroid height of the sodium layer.

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