Short-Term Cyclic Variations and Diurnal Variations of the Venus Upper Atmosphere

  title={Short-Term Cyclic Variations and Diurnal Variations of the Venus Upper Atmosphere},
  author={Gerald M. Keating and Fredric W. Taylor and John Y. Nicholson and Edwin W. Hinson},
  pages={62 - 64}
Measurements of satellite drag obtained from the orbital decay of the Pioneer Venus orbiter on the nightside of Venus indicate an atomic oxygen atmosphere near 155 kilometers (an order of magnitude less dense than expected) with nighttime inferred exospheric temperatures averaging as low as 110 K. Densities at these altitudes decrease sharply from day to night, contrary to the predicted nighttime oxygen bulge. This decrease may be indicative of an unexpectedly weak transport across the evening… 
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