Resonant lidar detection of Ca and Ca(+) in the upper atmosphere

Details Resonant lidar detection of Ca and Ca(+) in the upper atmosphere Resonant lidar detection of Ca and Ca(+) in the upper atmosphere

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985georl..12..655g&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 12, Oct. 1985, p. 655-658.

Physics

Optics

23

Atmospheric Composition, Calcium, Optical Radar, Radar Detection, Upper Atmosphere, Crystal Optics, Dye Lasers, Nonlinear Optics, Positive Ions, Vertical Distribution

Scientific paper

Resonant lidar detection of neutral (Ca-423 nm) and ionized (Ca/+/-393 nm) calcium altitude distributions has been performed at night 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 nonlinear 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 x 10 to the 7th/sq cm, 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.

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