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Resonant lidar detection of Ca and Ca + in the upper atmosphere
Author(s) -
Granier G.,
Jégou J. P.,
Mégie G.
Publication year - 1985
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl012i010p00655
Subject(s) - lidar , atmosphere (unit) , laser , ionization , altitude (triangle) , mixing ratio , ion , analytical chemistry (journal) , materials science , optics , physics , atmospheric sciences , chemistry , meteorology , environmental chemistry , geometry , mathematics , quantum mechanics
Resonant lidar detection of neutral (Ca‐423 nm) and ionized ( Ca + ‐ 393 nm) calcium altitude distributions has been performed during nighttime at the Observatoire de Haute‐Provence. The emitter is composed of two Nd‐Yag pumped dye lasers, the 393 nm emission being obtained by three waves mixing in a non‐linear crystal. The first detection of Ca has been carried out in December, 1982 and has shown that the integrated abundance of the atomic form is low, with a value of about 1.5 × 10 7 cm −2 , further confirmed by measurement performed in July, 1983. During this same month, the detection of Ca + has been achieved, proving the lidar ability to follow rapid evolutions of Ca + layers, which appear between 85 and 115 km altitudes.