Retrieval of atomic oxygen and temperature in the thermosphere. I - Feasibility of an experiment based on the spectrally resolved 147 micron limb emission

Details Retrieval of atomic oxygen and temperature in the thermosphere. I - Feasibility of an experiment based on the spectrally resolved 147 micron limb emission Retrieval of atomic oxygen and temperature in the thermosphere. I - Feasibility of an experiment based on the spectrally resolved 147 micron limb emission

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989p%26ss...37.1333z&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 37, Nov. 1989, p. 1333-1346.

Physics

Optics

7

Atmospheric Temperature, Electron Transitions, Oxygen Atoms, Spectral Resolution, Thermosphere, Atmospheric Chemistry, Earth Atmosphere, Ground State, Least Squares Method, Line Spectra, Oxygen Spectra

Scientific paper

Consideration is given to the possibility of recovering vertical profiles of the temperature and O-atom density from limb scan data obtained near 147 and/or 63 microns wavelength. It is shown that the two vertical profiles may be recovered by applying an onion-peeling method to synthetic data. The temperature and O-atom density are obtained simultaneously by a nonlinear least-squares spectrum fitting. It is found that spectral data in the 147-micron line from 300 km down to 130-90 km in altitude produces better results than the 63-micron data below 140 km. It is suggested that a confocal Fabry-Perot system operating near 147 microns could provide the S/N ratio and spectral resolution needed for successful retrievals. Retrievals down to 90 km from data obtained at orbital altitude would require cooled foreoptics with a diameter of about 1 meter.

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