Far infrared emission spectrum of the stratosphere from balloon altitudes

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Balloon-Borne Instruments, Emission Spectra, Far Infrared Radiation, Molecular Spectroscopy, Stratosphere Radiation, Abundance, Fine Structure, Gas Density, Infrared Interferometers, Ozone, Water

Scientific paper

Observations of the far infrared emission spectrum of the stratosphere made with a balloon-borne rapid-scanning interferometer from an altitude of 22 km at 58.7 deg N, 94 deg W are presented. The data were analyzed by a method which uses synthetic spectra to allow for the weak O3 lines and to normalize the observations to the O2 lines. In comparison with observations made at aircraft altitudes, the H2O and O2 lines are somewhat weaker. No lines of H2O from the less abundant isotopic species are apparent, and there is no evidence of emission from the dimer of H2O. Preliminary analysis of the spectra shows little evidence of emission from other minor constituents. The column densities of H2O and O2 above 22 km are about 1.1 times ten to the eighteenth and 5 times ten to the eighteenth molecules per sq cm, respectively.

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