Local time asymmetries in the Venus thermosphere

Details Local time asymmetries in the Venus thermosphere Local time asymmetries in the Venus thermosphere

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9810849a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. E6, p. 10,849-10,871.

Physics

15

Atmospheric Radiation, Oxygen Atoms, Satellite Imagery, Thermosphere, Ultraviolet Spectrometers, Venus Atmosphere, Imaging Spectrometers, Pioneer Venus Spacecraft, Venus, Thermosphere, Symmetry, Emissions, Oxygen, Ouvs Instrument, Spacecraft Observations, Pvo Mission, Structure, Wavelength, Patterns, Ultraviolet, Analysis, Density, Latitude, Circulation, Gravity Waves, Atmosphere, Eddy Diffusion, Mixing, Zoning, Wind, Equipment, Model, Geometry, Excitation, Calculations, Radiative Transfer, Procedure, Brigh

Scientific paper

A comparison is presented of the 130-m images taken in the Venus thermosphere by the Pioneer Venus Orbiter Ultraviolet Spectrometer (PVOUVS) to predictions by a model which incorporates current understanding of the global structure of the thermosphere, the mechanisms which excite the 130-nm transition in O, and the radiative transport of the 130-nm triplet in the thermosphere. The features identified in the data/model comparison appear as a local time asymmetry in B(130) and O at altitudes poleward of 30 deg. Oxygen densities at the evening terminator are typically a factor of 2 higher than those at the morning terminator. This asymmetry in O has never before been observed or predicted in the global thermospheric models.

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