Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2330..157c&link_type=abstract
In JPL Uranus and Neptune p 157-177 (SEE N85-11927 02-91)
Astronomy and Astrophysics
Astronomy
1
Aerosols, Albedo, Gas Dynamics, Planetary Radiation, Ultraviolet Astronomy, Ethane, Neptune (Planet), Spectral Resolution, Spectrophotometry, Uranus (Planet)
Scientific paper
From 2000 to 3000 A, both Uranus and Neptune have albedos that are about two times higher than Jupiter or Saturn's, implying that the outer giants have stratospheres that are relatively free of aerosol absorption. Uncertainties in the absolute calibration procedure allow discrepancies of order 15% between conservative models and the observations. A small amount of aerosol absorption is therefore possible. Below 2000 A the derived albedo is highly dependent on the solar spectrum source used in the data reduction. The most recent result for Uranus, first reported here, is consistent with a secular change in C2H2 mixing ratio from approximately three times ten to the minus eight in 1980 to less than or equal to ten to the minus ninth in 1983. These values are approximately 2 orders of magnitude less than the mixing ratios of this gas on Saturn, and comparable to the amount on Jupiter.
Caldwell J. Jr. J.
Combes Michel
Encrenaz Th.
Owen Theodore
Wagener Richard
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