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Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10295w&link_type=abstract
HST Proposal ID #10295
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Hst Proposal Id #10295 Solar System
Scientific paper
This proposal is to perform detailed analysis of STIS observations of the upper atmosphere of Mars, using an ionospheric model, general circulation model results for the neutral atmosphere, and various recent spacecraft observations of Mars. The end goal is to better understand the escape of oxygen, and by extension water, from Mars. The observations have yielded limb profiles of atomic hydrogen, atomic oxygen, and carbon monoxide with 24 km vertical resolution and a field of view that is thousands of km long. Most of the hydrogen and some of the oxygen atoms thus detected are escaping from Mars. There are no other measurements of volatiles escaping from Mars with nearly such high spatial resolution and large field of view. The data analysis in the original observing proposal will derive spatially-averaged escape rates of hydrogen and possibly oxygen at the time of the observations. This archival research will go beyond that analysis by investigating how the escaping species diffused through the upper atmosphere to reach the exobase and relating these observations of current escape rate to the time history of escape. The escape of water from Mars has had a major impact on its climate history, the understanding of which is a major scientific goal of NASA's Office of Space Science.
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