Ultraviolet observations of Uranus and Neptune below 3000 A

Details Ultraviolet observations of Uranus and Neptune below 3000 A Ultraviolet observations of Uranus and Neptune below 3000 A

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..501c&link_type=abstract

In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 501 (SEE N85-20961 11-89

Astronomy and Astrophysics

Astronomy

Neptune Atmosphere, Ultraviolet Astronomy, Uranus Atmosphere, Aerosols, Albedo, Hydrocarbons, Mixing

Scientific paper

From 2000 A 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 is consistent with a secular change in C2H2 mixing ratio from approximately 3 x (10 to the -8 power) in 1980 to or = 10 to the -9 power 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.

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