This paper presents experimental ir horizon profiles of the earth seen fromoutside the atmosphere. Measurements were made from a capsule which reached 175 km. The attitude was controlled during the whole flight by means of agyroscopic device. Seven spectral channels were studied, especially: ozone (9.6 µ), CO2 (14–16 µ), the range of atmospheric window (11µ), and a broad channel (1–50 µ) that was the only one of the firstexperiment in 1965. The spatial limit of resolution is 0.16°, and theattitude in space of the capsule has been reconstructed with an accuracy equalto 0.05° due to a star mapper. Results are expressed as variations ofradiance with respect to tangential height for the different spectral channels.
A. Girard and M. P. Lemaitre, "Profils experimentaux de I’horizon infrarouge de la terre," Appl. Opt. 9, 903-912 (1970)