Computer Science
Scientific paper
Jan 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978p%26ss...26...27m&link_type=abstract
Planetary and Space Science, vol. 26, Jan. 1978, p. 27-35.
Computer Science
28
Atmospheric Composition, Night Sky, Optical Radar, Potassium, Radar Measurement, Sodium, Annual Variations, Concentration (Composition), Diurnal Variations, Dye Lasers, Metal Ions, Optical Pumping, Q Switched Lasers
Scientific paper
Based on ion abundance measurements, Na and K concentrations are found to have similar day-to-day variations (indicating that the same processes work in a similar manner for both elements), but different annual variation. While Na abundance changes with the season, K abundance exhibits no such change. The abundance ratio therefore varies between a low summer value (approximately 10) and a high winter value (approximately 50). Two different mechanisms for the variation in the upper atmosphere are proposed: meteoric, consistant over the year, and terrestrial vertical ion transport, which works only in the winter. Attention is given to the calibration methods used for the experiment, i.e., a dye laser pumped by a Q-switched ruby laser to pinpoint exact element wavelengths.
Blamont E. J. E. J.
Bos F.
Chanin Marie-Lise
Mégie Gérard
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