Cloud Images from the Pioneer Venus Orbiter

@article{Travis1979CloudIF,
  title={Cloud Images from the Pioneer Venus Orbiter},
  author={Larry Travis and David Lee Coffeen and Anthony D. Del Genio and James E. Hansen and Kiyoshi Kawabata and Andrew A. Lacis and W. A. Lane and Sanjay S. Limaye and William B. Rossow and Peter H. Stone},
  journal={Science},
  year={1979},
  volume={205},
  pages={74 - 76}
}
Ultraviolet images of Venus over a 3-month period show marked evolution of the planetary scale features in the cloud patterns. The dark horizontal Y feature recurs quasi-periodically, at intervals of about 4 days, but it has also been absent for periods of several weeks. Bow-shaped features observed in Pioneer Venus images are farther upstream from the subsolar point than those in Mariner 10 images. 
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Phase angle is the angle between the sun-planet and planet-spacecraft directions. The latitudes listed are celestial latitudes, that is
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