Computer Science
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8659b&link_type=abstract
HST Proposal ID #8659
Computer Science
Hst Proposal Id #8659 Solar System
Scientific paper
We propose to record a single high spectral resolution observation of the Venus Lyman-alpha line, while HST is within Earth shadow and Venus is at 47.1 degrees solar elongation, with a supporting observation of the Lyman-alpha geocorona outside the exclusion zone {50 degrees}. This Lyman-alpha line profile will be compared with emergent line profiles from Venus thermosphere radiative transfer models to assess the energetics and contributions from supra-thermal sources of hydrogen, a long-standing issue in Venus aeronomy. This information will enhance understanding of the pathways of hydrogen escape from Venus and constrain models of Venus climate evolution. The line profile will be used to assess the abundance of deuterium in the Venus atmosphere, a quantity with great importance to atmospheric evolution models. The HST STIS instrument is the only instrument capable of making these far UV observations with sufficient spectral resolution to address the details of hydrogen energetics in the Venus thermosphere and exosphere. HST previously observed Venus with Esposito as PI {P4518 and P5783}.
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