Mars Express Observations of the Hydrogen Corona of Mars

Details Mars Express Observations of the Hydrogen Corona of Mars Mars Express Observations of the Hydrogen Corona of Mars

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1783c&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1783

Physics

Scientific paper

Mars Express observations of hydrogen Lyman alpha are analyzed, yielding information about the temperature and density of the Martian exosphere and hydrogen escape rate. Using detailed radiative transfer calculations appropriate to the optically thick hydrogen corona of Mars, we obtain the temperature and density of hydrogen atoms at the exobase. From these data, we estimate the escape rate of hydrogen from the atmosphere of Mars, with important implications for water loss rates and the early habitability of the Martian surface. Results will be presented on the full range of data collected by the SPICAM instrument on Mars Express, with particular emphasis on the variation in escape rate as a function of solar zenith angle. Implications for the MAVEN mission's detection of the hydrogen corona will also be discussed.

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