Carbon monoxide fourth positive ultraviolet airglow emissions on Venus

Details Carbon monoxide fourth positive ultraviolet airglow emissions on Venus Carbon monoxide fourth positive ultraviolet airglow emissions on Venus

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983phdt.........6s&link_type=abstract

Ph.D. Thesis Colorado Univ., Boulder.

Computer Science

Airglow, Carbon Monoxide, Venus Atmosphere, Calibrating, Carbon Dioxide, Photolysis, Solar Flux, Turbopause

Scientific paper

The ultraviolet spectrometer experiment aboard the Pioneer Venus orbiting spacecraft has recorded airglow spectra of the carbon monoxide (CO) fourth positive emission bands in the lambda 1250-1800 A spectra region. Extended duration of the PV mission since the December 4, 1978 orbit insertion has afforded opportunity to obtain many disc spectra, composite disc images and limb emission altitude profiles of the strongest (A'pi fields X' sigma +) electronic bands. Data were analyzed in terms of high resolution theoretical synthetic spectra calculated from a detailed multiple scattering radiative transfer model which postulates population of the excited II electronic state by the mechanisms of solar resonance absorption and photoelectron impact excitation of CO, excitation by solar ultraviolet photolysis and photoelectron impact dissociation of CO2, and dissociative recombination of CO2+ ions with thermal electrons. The predominant emission sources prove to be solar resonance scattering and dissociative recombination for all bands except those of the v' = 14 vibrational progression which are excited solely by resonance absorption of solar Lyman-alpha. Agreement between theory and observations is quite good with discrepancies attributable to uncertainties in the solar flux and instrument calibration. The density distribution of CO molecules below the 137 km turbopause altitude is inferred from the (14,5) band limb emission profile.

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