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Venus: global surface radar reflectivity.

G H Pettengill, P G Ford, S Nozette

    Science (New York, N.Y.)
    |August 13, 1982
    PubMed
    Summary
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    Pioneer Venus radar mapping reveals Venus

    Area of Science:

    • Planetary Science
    • Geophysics
    • Radar Astronomy

    Background:

    • Venus possesses a dense, corrosive atmosphere composed primarily of carbon dioxide.
    • Surface features of Venus are largely obscured by thick cloud layers, necessitating remote sensing techniques.
    • Previous observations have suggested diverse geological features on Venus, including volcanic plains and highlands.

    Purpose of the Study:

    • To investigate the surface reflectivity of Venus using radar mapping.
    • To characterize the dielectric properties of Venus' surface materials.
    • To identify potential geological compositions based on radar reflectivity.

    Main Methods:

    • Utilized the Pioneer Venus radar mapper.
    • Conducted observations at a wavelength of 17 centimeters.

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  • Analyzed radar reflectivity data across the Venusian surface.

    • Main Results:

    • Determined a global mean reflectivity of 0.13 +/- 0.03 at normal incidence.
    • Observed significant variations in reflectivity across the surface, ranging from 0.03 +/- 0.01 to 0.4 +/- 0.1.
    • Identified Theia Mons, a potentially volcanic region, exhibiting a reflectivity of 0.28 +/- 0.07.

    Conclusions:

    • High reflectivity regions may indicate the presence of rocks with significant inclusions of highly conductive sulfides.
    • Radar reflectivity provides insights into the composition and physical properties of Venus' surface.
    • Further investigation is needed to fully understand the geological implications of observed reflectivity variations.