Mid-latitude lidar observations of large sporadic sodium layers

Details Mid-latitude lidar observations of large sporadic sodium layers Mid-latitude lidar observations of large sporadic sodium layers

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16..715s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 16, July 1989, p. 715-718.

Physics

31

Atmospheric Stratification, Midlatitude Atmosphere, Optical Radar, Sodium, Mesopause, Morning, Time Response, Vertical Distribution

Scientific paper

During the early morning of October 31, 1988 two large sporadic Na layers were observed near the mesopause above Urbana, IL, with a Na lidar system. The layers began forming near 102 km at 0026 LST and 0110 LST and moved downward with vertical velocities as high as 4 m/s before dissipating between 94 and 96 km. The duration of each layer was approximately 80 min. The layers were narrow (about 1 km FWHM) and dense with maximum densities approaching 7800/cu cm. The characteristics of these two sporadic Na layers are very similar to those of similar phenomena observed recently at Andoya, Norway (von Zahn et al., 1987) and Mauna Kea, Hawaii (Kwon et al., 1988). Lidar observations of the mesospheric Na layer have been conducted routinely by several groups at midlatitudes for almost 20 years. Although large sporadic Na layers now appear to be relatively common at low-latitudes and high-latitudes, the two layers described in this letter may be only the second observation of this puzzling phenomenon at midlatitudes.

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