Hst Observations Of The Extended Hydrogen Corona Of Mars

Details Hst Observations Of The Extended Hydrogen Corona Of Mars Hst Observations Of The Extended Hydrogen Corona Of Mars

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.4911c&link_type=abstract

American Astronomical Society, DPS meeting #41, #49.11

Astronomy and Astrophysics

Astronomy

1

Scientific paper

HST ACS/SBC UV images of the extended H Ly alpha emission from the Martian hydrogen corona have been obtained over Oct/Nov 2007, with coincident measurements of the altitude profile of the Lyman alpha emission by the SPICAM instrument on Mars Express in orbit about Mars. Careful measurement of the geocoronal emission background permit the measurement of the martian emission to a low level (less than 1 kilo-Rayleigh) out to 4 mars radii from the planet. Similar angular distributions of the emission were seen on 3 days of observations, reflecting the radiative transfer in the optically thick atmosphere, while the overall level of emission was seen to steadily decrease in both data sets over 4 weeks time. The altitude distribution of the emission out to large distances is compared with the results of a radiative transfer model that includes an exospheric population of cold and hot H atoms. In general, the dominant population of H atoms close to the planet is consistent with the measured temperature of the upper atmosphere, while far from the planet one has the highest sensitivity to a superthermal component of the exospheric H. The results will be presented with discussion of the escape rate of H from the martian atmosphere, and how this varied over 4 weeks in Fall 2007. This has implications for the rate of escape of water from the martian atmosphere, and how this can vary with time. These observations were supported by STScI grant GO-11170-01 to Boston University.

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