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Detailed Reference Information |
Clemesha, B.R., Simonich, D.M., Takahashi, H., Batista, P.P. and Sahai, Y. (1992). The annual variation of the height of the atmospheric sodium layer at 23°S: possible evidence for convective transport. Journal of Geophysical Research 97: doi: 10.1029/91JD03146. issn: 0148-0227. |
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On the basis of a long series of lidar measurements made at S¿o Jos¿ dos Campos, it is found that the centroid height of the atmospheric sodium layer is about 1 km lower in November than during the rest of the year. Photometric measurements of the OH(9,4) and OI 557.7 nm airglow intensities, observed at a nearby location, show that these emissions have maximum values at this time of the year. The hydroxyl emission shows a sharp increase in intensity by about 20% in November, and the atomic oxygen emission has a broader peak in October, November, and December. There is a strong inverse correlation between the seasonal variations in sodium layer centroid height and the OH intensity, with a correlation coefficient of 0.86 and a regression coefficient of -89¿15 Rayleighs km-1. It is suggested that the anticorrelated variations in sodium layer height and airglow intensity could be the result of seasonal changes in convective transport in the lower thermosphere. ¿ American Geophysical Union 1992 |
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BACKGROUND DATA FILES |
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Abstract |
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Keywords
Meteorology and Atmospheric Dynamics, Middle atmosphere dynamics, Atmospheric Composition and Structure, Middle atmosphere—composition and chemistry, Atmospheric Composition and Structure, Airglow and aurora, Meteorology and Atmospheric Dynamics, Convective processes |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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