Lower-thermospheric infra-red emissions from minor species during high-latitude twilight - B: Analysis of 15 micrometer emission and comparison with non-LTE models

Details Lower-thermospheric infra-red emissions from minor species during high-latitude twilight - B: Analysis of 15 micrometer emission and comparison with non-LTE models Lower-thermospheric infra-red emissions from minor species during high-latitude twilight - B: Analysis of 15 micrometer emission and comparison with non-LTE models

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jatp...56.1899r&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 56, no. 13-14, p. 1,899-1,914

Computer Science

Sound

8

Atmospheric Composition, Atmospheric Radiation, Carbon Dioxide, Emission Spectra, Infrared Spectra, Night, Nitric Oxide, Atmospheric Models, Polar Regions, Radiance, Sounding Rockets, Spectrum Analysis, Thermodynamic Equilibrium

Scientific paper

During the DYnamics Adapted Network for the Atmosphere (DYANA) campaign, a Skylark VI rocket, known as Spectroscopic Infrared Structure Signitures Investigation - 1 (SISSI-1) and containing an infrared grating spectrometer and other onboard instruments including an atomic-oxygen sensor, was launched at dawn twilight from Esrange, Kiruna, Sweden. Molecular vibrational emission features of carbon dioxide at 4.3 and 15.0 micrometers, nitric oxide at 5.3 micrometers, and ozone at 9.6 micrometers were measured in the lower thermosphere. In this paper, we analyzed the CO2 15 micrometers data in terms of the radiative and collisional excitation and loss processes involved and compared the experimental results to non-local thermodynamic equilibrium (non-LTE) radiance models. Good agreement is obtained over a range of altitudes and wavelengths between the predictions of the atmospheric radiance code (ARC) line-by-line non-LTE radiance code and the experimental data for SISSI-1, as well as between model simulations and data from a similar payload known as M-I1 launched under drastically different conditions as part of the MAP/WINE campaign. The data sets provide useful opportunities for more stringent tests of the important role of atomic oxygen in CO2 15 micrometers non-LTE radiance models than available until now and for determining the region of applicability of the LTE assumption, as well as for investigating a lower-thermospheric energy balance.

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