Aerosols in Planetary Atmospheres: Cycle 1 Observations

Details Aerosols in Planetary Atmospheres: Cycle 1 Observations Aerosols in Planetary Atmospheres: Cycle 1 Observations

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2564t&link_type=abstract

HST Proposal ID #2564

Other

Hst Proposal Id #2564

Scientific paper

Our goal is to determine the vertical and horizontal distribution and optical properties of stratospheric aerosols in the atmospheres of the outer planets Jupiter and Saturn to constrain models of their photochemical production, vertical and horizontal transport, absorption of solar and thermal radiation, and role in forcing atmospheric dynamics. Observations needed for this purpose include photometry which 1) spans a wide range of wavelengths to permit discrimination in particle size; 2) refers to limited pressure ranges; 3) tracks specific planetary features. Carefully timed HST WFPC successive telescope orbits permit a wide spread in airmass factors at many planetary longitudes for good vertical discrimination both by the 8888A methane band at long wavelengths and by Rayleigh scattering at short wavelengths. These images at wavelengths separated by a factor >3 also provides good discrimination in the size of small stratospheric aerosols. No other technique is available which can provide either the simultaneous wide wavelength coverage or the spatial resolution to use center-to-limb variations to limit the vertical region probed on the outer planets. In addition, repeating such observations yearly permits temporal changes to be monitored for a new understanding of seasonal variations and the role of the solar cycle in these stratospheres.

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