Abstract:Upper atmospheric atomic sodium abundances have been measured near Ankara (39.9°N, 32.6°E), Turkey, from February 1976 to April 1977. The daytime absorption measurements were made with a Pepsios spectrometer using the solar radiation near the D2 line of sodium at 5890 Å. Seasonal and daily variations of the sodium abundance were examined. A seasonal variation appears to be present with maximum abundance values occurring near the end of February and minimum values occurring in April. No significant evidence was… Show more
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