Radar observations of the icy Galilean satellites

Details Radar observations of the icy Galilean satellites Radar observations of the icy Galilean satellites

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980icar...44..431o&link_type=abstract

(IAU, American Astronomical Society, COSPAR, University of Hawaii, and NASA, Colloquium on the Satellites of Jupiter, 5th, Kailu

Astronomy and Astrophysics

Astronomy

20

Galilean Satellites, Radar Astronomy, Albedo, Callisto, Circular Polarization, Doppler Effect, Europa, Ganymede, Linear Polarization, Radar Imagery

Scientific paper

It is shown that when combined with previous observations, 12.6 cm radar observations of Europa, Ganymede and Callisto made at the Arecibo Observatory in November 1977 and February 1979 firmly establish the distinguishing radar properties of the satellites: (1) high geometric albedos, (2) circular polarization ratios which anomalously exceed unity, (3) linear polarization ratios of approximately 0.5, and (4) diffuse scattering, which varies with the cosine of the angle of incidence. The weighted-mean values of these properties are tabulated, and it is found that although significant albedo and/or polarization features are common in the radar spectra, the fractional root mean square fluctuations in disk-integrated properties is only about 10%.

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