Mathematics – Logic
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3616m&link_type=abstract
HST Proposal ID #3616
Mathematics
Logic
Hst Proposal Id #3616
Scientific paper
Far-ultraviolet observations of the planets Uranus and Neptune are proposed to detect and accurately measure the upper-atmospheric molecular hydrogen emissions with higher S/N and spectral resolution than has been achievable previously. Until the advent of the HST, the only previous remote detection of these planets at wavelengths below 1800A has been Ly-alpha emission from Uranus. The proposed program is the logical extension of a currently-approved program (GO 2625) for similar observations of Jupiter and Saturn, which is designed to facilitate detailed intercomparisons among all the outer planets by making a thorough inventory of their far-UV emissions. These observations will determine the dominant excitation process for the upper atmospheric emissions, which is a critical question because of its possible link to the unexpectedly high exospheric temperatures revealed by the Voyager flybys. Planet to planet variations in the excitation mechanism(s) and their variation with solar input will also be determined.
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