title: Cloud images from the pioneer venus orbiter.
abstract: 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.
authors.forename: L D
authors.initials: LD
authors.lastname: Travis
authors.forename: D L
authors.initials: DL
authors.lastname: Coffeen
authors.forename: A D
authors.initials: AD
authors.lastname: Del Genio
authors.forename: J E
authors.initials: JE
authors.lastname: Hansen
authors.forename: K
authors.initials: K
authors.lastname: Kawabata
authors.forename: A A
authors.initials: AA
authors.lastname: Lacis
authors.forename: W A
authors.initials: WA
authors.lastname: Lane
authors.forename: S S
authors.initials: SS
authors.lastname: Limaye
authors.forename: W B
authors.initials: WB
authors.lastname: Rossow
authors.forename: P H
authors.initials: PH
authors.lastname: Stone