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Ganymede: observations by radar.

R M Goldstein, G A Morris

    Science (New York, N.Y.)
    |June 20, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Radar measurements reveal Ganymede reflects only 12% of expected power, similar to Venus, and is rougher than other planets. This indicates a unique surface composition and structure for Ganymede.

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    Area of Science:

    • Planetary Science
    • Radio Astronomy
    • Surface Physics

    Background:

    • Radar cross-section measurements are crucial for understanding planetary body reflectivity.
    • Previous studies have characterized the scattering properties of various solar system objects.

    Purpose of the Study:

    • To measure and analyze the radar cross-section of Ganymede.
    • To compare Ganymede's scattering properties with other celestial bodies.
    • To assess the surface roughness of Ganymede based on radar echoes.

    Main Methods:

    • Utilized radar measurements to determine the power scattered back to Earth from Ganymede.
    • Compared Ganymede's scattering efficiency (12%) to that of Mercury (6%), Mars (8%), Venus (12%), and asteroid Toro (8%).
    • Analyzed the distribution of radar echoes to infer surface roughness at a 12.6 cm wavelength.

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    Main Results:

    • Ganymede scatters 12% of the expected power, comparable to Venus.
    • Ganymede exhibits significantly greater surface roughness than Mercury, Venus, and Mars at the observed wavelength.
    • Radar echoes from Ganymede indicate scattering from over the entire disk, unlike a smooth target.

    Conclusions:

    • Ganymede's radar scattering properties suggest a surface composition or structure distinct from other terrestrial planets and asteroids.
    • The observed roughness implies a complex surface morphology on Ganymede.
    • Further investigation into Ganymede's surface characteristics is warranted based on these radar findings.