Retrieval of atomic oxygen and temperature in the thermosphere. II - Feasibility of an experiment based on limb emission in the OI lines

Details Retrieval of atomic oxygen and temperature in the thermosphere. II - Feasibility of an experiment based on limb emission in the OI lines Retrieval of atomic oxygen and temperature in the thermosphere. II - Feasibility of an experiment based on limb emission in the OI lines

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990p%26ss...38..221s&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 38, Feb. 1990, p. 221-230.

Physics

8

Emission Spectra, Oxygen Atoms, Thermosphere, Doppler Effect, Fabry-Perot Interferometers, Ground State, Radiative Transfer, Temperature Distribution, Vertical Distribution

Scientific paper

A viable technique for the remote sensing of the O I density and translational temperature profiles above 80 km altitude, where O atoms are involved in important chemical, collisional, and radiative cooling processes, would have enormous value. The two profiles can, in principle, be recovered simultaneously from limb scan data obtained near wavelength 147 and/or 63 microns, corresponding to the intermultiplet transitions in the ground electronic state of O I. Here, the feasibility of the experimental concept when the data are a pair of limb radiance profiles corresponding to the two unresolved O I lines is evaluated; temperature retrieval relies mostly on the difference in upper state populations. It is concluded that stable profiles for the altitude range 90-300 km can be recovered when the noise-equivalent radiances in the two channels are no greater than roughly 10 to the -13th W/sq cm sr.

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