From molecules to aerosols: observing the haze creation process during Titan's polar summer

Details From molecules to aerosols: observing the haze creation process during Titan's polar summer From molecules to aerosols: observing the haze creation process during Titan's polar summer

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9745l&link_type=abstract

HST Proposal ID #9745

Computer Science

Hst Proposal Id #9745 Solar System

Scientific paper

Our Cycle 11 observations of Titan at southern summer solstice reveal unexpected complexity and an opportunity for science that has not previously been possible. Titan currently has a polar hood below 65 degrees S. The polar hood is dark in the visible relative to the southern mid-latitudes, as is Titan's northern hemisphere. In the UV and near-IR, the hood is spectrally distinct from the better-known north-south asymmetry, indicating a different formation mechanism. The nature of the relation between the southern summer hood and the northern spring equinox polar hood observed by Voyager is uncertain. We propose a set of ultraviolet and supporting observations to demonstrate the nature of temporal changes in the hood and to look for expected stratospheric absorbing gasses. The gasses are precursors to Titan's aerosols; the polar hood may be an early stage of aerosol evolution. Our observations will provide important constraints on the chemistry and dynamics of Titan's stratosphere at summer solstice. The chance to follow-up our observations of the polar hood will allow us to assess the processes and changes that are occurring now, so that Cassini observations of the polar regions will not need to be interpreted in isolation from seasonal context.

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