Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978icar...33..263j&link_type=abstract
Icarus, vol. 33, Feb. 1978, p. 263-278.
Astronomy and Astrophysics
Astronomy
4
Brightness Temperature, Microwave Interferometers, Millimeter Waves, Radio Astronomy, Saturn Rings, Ice, Metals, Microwave Scattering, Thermal Emission, Water, Saturn, Rings, Brightness, Dielectric Properties, Particles, Density, Grain Size, Temperatures, Emissions, Heat Flow, Water, Ice, Spectrum, Radar Echoes, Interferometry, Composition
Scientific paper
The brightness temperature of Saturn's rings has been measured at 8-mm wavelength using a millimeter-wavelength interferometer. A ring brightness temperature of 12.7 + or -2 K is obtained with the assumption that the rings are of uniform brightness and the region of emission coincides with the visible A and B rings. This result is higher than comparable results obtained at centimeter wavelengths and may indicate a small increase in the thermal emission from the rings at 8 mm. The low brightness temperature places significant constraints on the nature of the ring particles and implies that they must be either highly metallic or of limited size and composed of a low-loss dielectric material such as water ice.
Janssen Michael A.
Olsen Edward T.
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