Travis et al. 1979
Travis, L.D., D.L. Coffeen, J.E. Hansen, K. Kawabata, A.A. Lacis, W.A. Lane, S.A. Limaye, and P.H. Stone, 1979: Orbiter cloud photopolarimeter investigation. Science, 203, 781-785, doi:10.1126/science.203.4382.781.
The first polarization measurements of the [Pioneer Venus] orbiter cloud photopolarimeter have detected a planet-wide layer of submicrometer aerosols of substantial visible optical thickness, of the order of 0.05 to 0.1, in the lower stratosphere well above the main visible sulfuric acid cloud layer. Early images show a number of features observed by Mariner 10 in 1974, including planetary scale markings that propagate around the planet in the retrograde sense at roughly 100 meters per second and bright- and dark-rimmed cells suggesting convective activity at low latitudes. The polar regions are covered by bright clouds down to latitudes approximately 50 degrees, with both caps significantly brighter (relative to low latitudes) than the south polar cloud observed by Mariner 10. The cellular features, often organized into clusters with large horizontal scale, exist also at mid-latitudes, and include at least one case in which a cell cuts across the edge of the bright polar cloud of the northern hemisphere.
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Travis, L.D., Coffeen, D.L., Hansen, J.E., Kawabata, K., Lacis, A.A., Lane, W.A., Limaye, S.A., and Stone, P.H.: Orbiter cloud photopolarimeter investigation, Science, 203, 781-785, doi:10.1126/science.203.4382.781, 1979.
Travis, L.D., D.L. Coffeen, J.E. Hansen, K. Kawabata, A.A. Lacis, W.A. Lane, S.A. Limaye, and P.H. Stone (1979), Orbiter cloud photopolarimeter investigation, Science, 203, 781-785, doi:10.1126/science.203.4382.781.
Travis, L.D., D.L. Coffeen, J.E. Hansen, K. Kawabata, A.A. Lacis, W.A. Lane, S.A. Limaye, and P.H. Stone, 1979: Orbiter cloud photopolarimeter investigation. Science, 203, 781-785, doi:10.1126/science.203.4382.781.
Travis, L.D., Coffeen, D.L., Hansen, J.E., Kawabata, K., Lacis, A.A., Lane, W.A., Limaye, S.A., & Stone, P.H. 1979, Science, 203, 781, doi:10.1126/science.203.4382.781.
Travis LD, Coffeen DL, Hansen JE, Kawabata K, Lacis AA, Lane WA, Limaye SA, Stone PH. Orbiter cloud photopolarimeter investigation, Science 1979;203:781-785. doi:10.1126/science.203.4382.781.
L.D. Travis, D.L. Coffeen, J.E. Hansen, K. Kawabata, A.A. Lacis, W.A. Lane, S.A. Limaye, P.H. Stone, Science 203, 781-785, doi:10.1126/science.203.4382.781 (1979).
