Other
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.9917g&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, July 20, 1989, p. 9917-9924. Research supported by CNES.
Other
17
Atmospheric Composition, Calcium, Upper Atmosphere, Annual Variations, Mass Spectroscopy, Meteoritic Composition, Optical Radar, Sodium, Vertical Distribution
Scientific paper
Resonant lidar measurements of calcium and sodium atoms and calcium ions have been made from 1982 to 1987 at the Observatoire de Haute Provence. An average value of the column atomic calcium abundance of 2.7 x 10 to the 7th/sq cm has been measured; it is 120 times lower than the corresponding sodium abundance. Average density profiles of these two species are also compared for each season. For the calcium ions, two different types of profiles have been identified. Diffuse Ca(+) layers are centered around 94 km and constitute the background ionic calcium layer. Denser and narrower layers, presenting strong short-time-scale variations are centered in the 95- to 115-km altitude range. Comparisons are made between Ca and Ca(+) density profiles determined by lidar mesurements and other techniques, such as mass spectrometry. Finally, the relative abundance in the atmosphere and in meteorites of these two metallic species, Ca and Na, are briefly discussed.
Granier Claire
Jegou J. P.
Mégie Gérard
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