Physics
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icar...53...18t&link_type=abstract
(NASA, International Conference on the Venus Environment, Palo Alto, CA, Nov. 1-6, 1981.) Icarus, vol. 53, Jan. 1983, p. 18-25.
Physics
6
Aerosols, Atmospheric Temperature, Haze, Upper Atmosphere, Venus Atmosphere, Venus Clouds, Cloud Glaciation, Nucleation, Planetary Limb, Spaceborne Photography, Sulfuric Acid, Vapor Pressure, Venus, Mesosphere, Ice, Dust, Acids, Aerosols, Origin, Atmosphere, Physical Properties, Particles, Classification, Sulfuric Acid, Clouds, Temperature, Structure, Layers, Altitude, Mesopause, Nucleation, Ions, Optical Properties, Haze, Observations, Pioneer Venus
Scientific paper
Four distinct types of particles are suggested to be present in the upper atmosphere of Venus. The lowest and densest haze may consist of a submicron sulfuric acid aerosol which extends above the cloud tops, up to about 80 km, representing an extension of the upper cloud deck. Temperature structure measurements in the 70-120 km altitude range indicate the occasional appearance of two independent water ice layers, of which the lower may form between 80 and 100 km and is probably the detached haze layer noted in high contrast limb photography. A nucleation of this ice layer on sulfuric acid aerosols is hypothesized. Temperatures of the Venus mesopause, near 120 km altitude, are frequently cold enough to allow ice nucleation on meteoric dust or ambient ions, yielding a haze (analogous to noctilucent clouds on earth) which is expected to be tenuous to the point of optical invisibility.
Keesee R. G.
Toon Brian O.
Turco Richard P.
Whitten Robert C.
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