Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9220s&link_type=abstract
HST Proposal ID #9220
Computer Science
Hst Proposal Id #9220 Solar System
Scientific paper
Neptune has zonal cloud bands with latitude boundaries and relative intensities that vary substantially with wavelength and have evolved significantly between 1989 Voyager observations and the 1994-1998 period of HST observations. We propose to investigate the nature of these cloud bands using 1996 archived WPFC2 and IRTF NSFCAM observations, and 1998 WFPC2 and NICMOS archived observations. Latitude dependent cloud particle composition and scattering properties will be constrained by analysis of spectral variations and limb darkening characteristics. Zonal averaging will permit high signal-to-noise ratios that are needed to characterize relatively subtle features. We will explore effects of variations in cloud optical depth, single-scattering albedo, cloud scale height, and possible variations in methane mixing ratios, to evaluate possible causes for the banded appearance. This effort will extend beyond previous Neptune-directed analyses of these data sets, which focussed mainly on dynamics and the structure of discrete cloud features.
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