Computer Science
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8351r&link_type=abstract
HST Proposal ID #8351
Computer Science
Hst Proposal Id #8351 Solar System
Scientific paper
We propose to combine all the available WFPC2 and NICMOS images of Uranus to investigate the causes of Uranus' long- term temporal variability, including several discrete clouds which apparently have lifetimes of several months. The PI has already developed atmospheric scattering models to fit the Voyager observations of Uranus' southern hemisphere {Rages Etal 1991, Rages and Pollack 1994}, and is now modifying them to reproduce the Cycle 6 WFPC2 observations of Hammel et al. We propose to enhance the vertical resolution of the Cycle 6 models by inclusion of the Cycle 7 data of Tomasko et al., and to model observations from previous cycles to investigate the timing of possible changes in {1} the methane cloud's altitude, optical thickness, and single scattering albedo; {2} aerosol absorption below the base of the methane cloud; and {3} height of the putative H_2S cloud at 3 bars. We will examine northern latitudes up to 30degrees N to check for possible hemispheric asymmetries in the atmospheric structure. We will also study how the structure of the discrete clouds differs from that of the surrounding atmosphere. The work proposed here complements our previous Cycle 6, approved Cycle 7 and requested Cycle 8 observations of Uranus by {1} extending the wavelength range for modeling of our pre-1998 observations and {2} using data from 1994 and 1995 to partially fill the 10-year gap since the Voyager encounter.
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