Clouds and Aerosols on Saturn and Uranus

Details Clouds and Aerosols on Saturn and Uranus Clouds and Aerosols on Saturn and Uranus

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6030t&link_type=abstract

HST Proposal ID #6030

Computer Science

Sound

Hst Proposal Id #6030 Solar System

Scientific paper

Our goal is to determine the vertical and horizontal distributions, and the optical and microphysical properties, of aerosols and clouds in the atmospheres of the outer planets. This information is needed to understand the roles of aerosols in forcing atmospheric circulation and particle microphysics. To achieve these goals we propose to acquire WFPC2 images of Saturn and Uranus in the UV, visible, and near -IR methane and continuum regions. UV and blue images provide vertical sounding of the absorptive part of the aerosol opacity, critical for heat-balance studies, while the methane bands give information on the scattering part. The combination of the two provides an estimate of particle size from the wavelength dependence of the opacity. HST observations are critical because (1) UV images can only be obtained by HST, (2) the high resolution provided by HST is required for center-to-limb coverage, and (3) of existing space observations, only HST provides a suitable wide range of filters. Observations taken during Saturn's ring-plane crossing in 1995 permit superior imaging of both hemispheres, especially in methane bands. New observations of Uranus can take advantage of the improved geometry for center-to-limb observations. This proposal is similar to one originally selected for Cycle 1 (program number 2564) for the outer planets that had to be limited to Jupiter and Saturn due to the degraded performance of the original HST optics.

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