Zonal winds in the middle atmosphere of Venus from Pioneer Venus radio occultation data

Computer Science

Scientific paper

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Middle Atmosphere, Radio Occultation, Venus Atmosphere, Wind Velocity, Atmospheric Temperature, Ceilings (Meteorology), Latitude, Pioneer Venus 1 Spacecraft, Venus, Atmosphere, Zones, Winds, Pioneer Venus, Radio Occultations, Seasonal Variations, Temperature, Velocity, Altitude, Latitude, Jets, Clouds, Barotropy, Polar Regions, Eddies, Comparisons

Scientific paper

The present investigation is concerned with the derivation of zonal winds for the middle atmosphere (40-80 km) of Venus, using Pioneer Venus (PV) radio occultation data. The considered altitude range is of particular interest because the atmospheric circulation of Venus is uncertain above the cloud tops (65-70 km). The Pioneer Venus orbiter began circling the planet every 24 hours on December 4, 1978. Four seasons of occultation data have now been collected. It is found that the assumption of cyclostrophic balance, in conjunction with radio occultation derived temperature data, yields a zonal wind field for most of the middle atmosphere of Venus. An intense midlatitude jet at and above the cloud tops is the most notable feature of the winds.

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