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In recent years, radar has been used to study the surfaces of the planets Mercury, Venus, Mars , and Jupiter. In the case of Venus, attenuation in the planetary atmosphere at short wavelengths has also been reported. For Mercury and Venus , where the diurnal rotation is difficult to establish by other means, radar has provided a clear-cut determination of the sidereal periods as 59 and 247 days, respectively. Mercury is found to possess surface conditions not unlike those on the Moon. Venus appears to have a surface considerably denser and smoother than the Moon, but displaying several localized reo gions of scattering enhancement. Mars appears smoother than the other planets, with a marked degree of surface differentiation. Except for one brief period of observation in 1963, Jupiter appears exceedingly ineffi cient as a refl ector of decimetric radio energy.

A review of radar studies of planetary surfaces