Analysis and interpretation of observations of airglow at 297 NM in the Venus thermosphere

Astronomy and Astrophysics – Astronomy

Scientific paper

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Airglow, Thermosphere, Ultraviolet Astronomy, Venus Atmosphere, Atmospheric Models, Ion Density (Concentration), Temperature Profiles, Ultraviolet Spectrometers, Vertical Distribution, Venus, Thermosphere, Analysis, Airglow, Pvo Mission, Ouvs Instrument, Spacecraft Observations, Spectrometry, Ultraviolet, Wavelengths, Source, Scattering, Altitude, Oxygen, Photodissociation, Emissions, Thermal Effects, Temperature, Experiments

Scientific paper

Data obtained by the Pioneer Venus Orbiter's UV spectrometer for the limb profiles near periapsis, with the instrument's grating set to a bandpass-center wavelength of 297 nm, are analyzed to identify the sources giving rise to the observed signals, which are forbidden O I 2972 A and C I 2967 A. Structure in the forbidden O I 2972 A emission profile in the lower thermosphere is explained in terms of large temperature excursions altering the quenching rate of O(1S) by CO2.

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