Seasonal and Nocturnal Variations of the Mesospheric Sodium Layer at Starfire Optical Range, New Mexico
Author(s) -
Xiong Hu,
Chester S. Gardner,
Alan Z. Liu
Publication year - 2003
Publication title -
chinese journal of geophysics
Language(s) - English
Resource type - Journals
eISSN - 2326-0440
pISSN - 0898-9591
DOI - 10.1002/cjg2.3360
Subject(s) - nocturnal , sunrise , daytime , atmospheric sciences , environmental science , range (aeronautics) , lidar , sodium , climatology , physics , geology , chemistry , materials science , optics , astronomy , composite material , organic chemistry
The seasonal variations of the mesospheric sodium layer structure over Starfire Optic Range (SOR: 35 ° N, 106.5 ° W), New Mexico are characterized using 46 night data of Na wind/temperature lidar observations collected from Jan. 1998 to May 2000. The column abundance has a mean value of 5.06×10 9 cm – 2 and strong annual oscillations with a maximum in November and a minimum in June and July. The annual mean rms width of the sodium layer is 4.30km and the mean centroid height is 91.60 km. Semiannual oscillations are evident in seasonal variations of the rms width and the centroid height. Their mean nocturnal variations show effects of tides. The photo‐ionization during daytime and recombination processes of Na at night, as well as tidal dynamics, induce strong nocturnal variations in the sodium abundance with a minimum just before midnight and a maximum just before sunrise.
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