12 July 1983 Atmospheric Infrared Emission Observed At Altitude Of 27000 To 28000m
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The molecules in the lower part of atmosphere are in thermal equilibrium with the local surrounding. The infrared emission resulted by their thermal excitation can be studied to determine their temperature and concentration profile in the atmosphere. We used a cryogenically cooled Fourier spectrometer mounted on a balloon-borne platform to study the infrared emission spectrum of atmosphere for this purpose. The experiment, which took place on October 7, 1981, at Holloman AFB, produced the analyzable data for more than two hours at altitude of 27000 ~ 28000 m along the horizontal and the vertical line of sight. The spectral data extended from 550 cm-1 to 1000 cm-1 covering the CO2 15μ bands (Δv2 = 1) with a resolution of 0.2 cm-1. The data were found interesting on two accounts: (1) a continuum background feature was superimposed with the molecular emission feature; (2) the radiance level of the CO2 15μ bands observed along the horizontal line of sight varied by a much greater degree than expected.
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Hajime Sakai, Hajime Sakai, George Vanasse, George Vanasse, } "Atmospheric Infrared Emission Observed At Altitude Of 27000 To 28000m", Proc. SPIE 0366, Modern Utilization of infrared Technology VIII, (12 July 1983); doi: 10.1117/12.934244; https://doi.org/10.1117/12.934244

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