Computer Science
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12239h&link_type=abstract
HST Proposal ID #12239. Cycle 18
Computer Science
Scientific paper
The upper atmosphere {stratosphere and thermosphere} of Uranus is highlyanomalous among the giant planets, for reasons that are poorlyunderstood. One likely factor is Uranus' uniquely large obliquity andlow internal heat source, so that during its year, localized atmosphericheating varies drastically. Thus, to understand the influence of thisseasonal variation on upper atmospheric dynamics, observations made overat least one Uranian solstice-to-equinox season are key.The most comprehensive observations of Uranus were made in 1986 byVoyager 2 during its flyby, which occurred when the planetary spin axispointed nearly at the sun {i.e., extreme solstice}, nearly suppressinglocal diurnal variation of insolation. At present, Uranus has justpassed equinox, so that local diurnal insolation variation is nearly100%, and so re-observing Uranus' upper atmosphere now would comprisethe ideal comparison for understanding its seasonal dynamics.Therefore, we propose two orbits of HST/STIS FUVMAMA/G140L time-taggedspectral images of the sunlit disk of Uranus, in order to obtainspatially resolved spectra of its airglow in the 1300-1650 A region. Bycomparing these spectra with those from 1986, we will determine theinfluence of seasonality on Uranus' upper atmospheric dynamics.;
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