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Planetary Brightness Changes: Evidence for Solar Variability

G. W. Lockwood
Science
New Series, Vol. 190, No. 4214 (Nov. 7, 1975), pp. 560-562
Stable URL: http://www.jstor.org/stable/1740437
Page Count: 3
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Planetary Brightness Changes: Evidence for Solar Variability
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Abstract

Brightness changes of Uranus and Neptune at 440 nanometers were highly correlated from 1956 to 1966. Recent observations of Saturn's satellite Titan and of Uranus and Neptune show a steady brightening at 551 and 472 nanometers since 1972. Either the solar constant is slightly variable or solar activity causes correlated changes in the albedos of planetary bodies.

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