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A lidar has been operated in São José dos Campos, Brazil (23.2°S, 45.8°W) since 1972, mainly dedicated to the study of mesospheric sodium at the 589nm resonant line. The molecular Rayleigh scattering can also be used provided we limit the height to ∼75km where the sodium scattering begins. Nevertheless, the weak signal obtained only permits the determination of density and temperature profiles by...
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