FUV diagnostic of Saturn's stratosphere with STIS. Water influx from the ring and polar haze

Details FUV diagnostic of Saturn's stratosphere with STIS. Water influx from the ring and polar haze FUV diagnostic of Saturn's stratosphere with STIS. Water influx from the ring and polar haze

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8158p&link_type=abstract

HST Proposal ID #8158

Computer Science

Hst Proposal Id #8158 Solar System

Scientific paper

This program addresses several outstanding issues concerning Saturn's upper stratosphere by means of UV long slit spectroscopy with STIS {6 orbits}. In the wavelength range of interest, 1150 - 3100 Angstrom, lie the signatures of scattering by aerosols and of absorption by stratospheric species, and the auroral H and H_2 emissions. The issues cover thermochemical equilibrium and dynamics of the atmosphere through the abundance and latitudinal distribution of the species {hydrocarbons, phosphine, water}. We will particularly focus on two particular issues for which we have obtained promising preliminary results in Cycle 4 with GHRS: {i} The distribution of the abundance of heavy hydrocarbons {identified in Cycle 4 spectra} and aerosols in the polar haze with respect to the locus of the aurorae {their assumed source}, in order to investigate haze generation processes and transport. {ii} The latitudinal profile of exogenous water in the atmosphere of Saturn {for which we have d etected a strong maximum at southern mid latitudes near the B-C ring footprint in Cycle 4} . The effect of this influx on the composition of Saturn's atmosphere will be inferred from photochemical models and compared to observations {e.g. observed anomalies in CO, H and ionospheric densities}. A quantitative and accurate latitudinal profile of water abundance would be an essential test of electromagnetic theories of ring erosion and of the age of the rings.

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