The 20-micron brightness temperature of the unilluminated side of Saturn's rings

Details The 20-micron brightness temperature of the unilluminated side of Saturn's rings The 20-micron brightness temperature of the unilluminated side of Saturn's rings

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.287..212t&link_type=abstract

Nature, vol. 287, Sept. 18, 1980, p. 212-214.

Astronomy and Astrophysics

Astronomy

5

Astronomical Models, Brightness Temperature, Infrared Astronomy, Plasma Heating, Saturn Rings, Flux Density, Infrared Telescopes, Pioneer 11 Space Probe, Solar Orbits, Saturn, Rings, Brightness Temperature, Models, Particles, Heating, Infrared, Data, Photometry, Observations, B Ring, Spectrum, Procedure, Emissions, Cassini Division

Scientific paper

Observations of the 20-micron brightness temperature of the unilluminated (north) side of Saturn's rings are presented and discussed in terms of models of B ring heating. Observations centered on the B ring ansae were made at 19.8 microns by the 3-m IR telescope facility on Mauna Kea during a period when the unilluminated side of the rings could be observed from earth. Flux measurements indicate a 20-micron brightness temperature of 56 + or - 1 K, in agreement with that measured at 45 microns by Pioneer 11. Under the assumptions that the emission of the Cassini division is negligible and that the ring brightness temperature is close to the actual temperature, it is shown that the brightness temperature can be accounted for by heating by the disk of Saturn, and is proportional to the sine of the Saturnicentric declination of the sun.

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