Physics
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jatp...43..327r&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 43, Apr. 1981, p. 327-337.
Physics
16
Mesosphere, Midlatitude Atmosphere, Optical Radar, Sodium Vapor, Digital Filters, Gas Density, Signal Processing, Vertical Distribution
Scientific paper
Atmospheric sodium has been observed over Urbana (40 deg 10 min N, 88 deg 10 min W) using a monostatic lidar tuned to 589.0 nm. The photocount data are processed using ditital smoothing filters to obtain continuous estimates of the sodium density versus altitude. The filter cutoff frequency is related to the height resolution and accuracy of the estimated profile. Wavelike structures in the sodium layer have been observed with typical wavelengths of 3-15 km and phase velocities of 1-3 m/s. The layer is characterized by a sharp falloff on the bottomside and often an undulatory motion of the bottomside of the layer accompanies the wave motion. The topside gradient of the layer is frequently observed to decrease through the night.
Gardner Chester S.
Richter E. S.
Rowlett J. R.
Sechrist Chalmers F. Jr.
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