Computer Science – Sound
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.3012c&link_type=abstract
American Astronomical Society, DPS meeting #42, #30.12; Bulletin of the American Astronomical Society, Vol. 42, p.1029
Computer Science
Sound
Scientific paper
We present a comparison of theoretical radiance calculations to observations of the hydrogen corona of Mars. The altitude-dependence of Lyman alpha airglow (observed by spacecraft limb sounding) provides a means of measuring the temperature and density of hydrogen atoms at the exobase. Characterizing the temperature allows us to 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. In the present work, I compute the intensity and altitude-dependence of Lyman alpha airglow from Mars' hydrogen corona based on a theoretical model accounting for the production and diffusion of hydrogen through a background atmosphere of CO2 below the exobase. Above the exobase, the distribution of hydrogen takes the form of a classical Chamberlain exosphere without satellite particles. Because the Lyman alpha airglow is optically thick, a full account of resonance-line radiative transfer is developed, according to principles established by Chaufray et. al. . The radiative transfer equation is solved numerically, and modeled intensity profiles are developed for comparison with observations made by SPICAM on Mars Express. Based on the model, we extract information sufficent to determine the temperature and density variability of hydrogen in the exosphere of Mars. Results will be presented on coronal variation across a set of observations made by SPICAM.
References:
Chaufray et. al. 2008 "Observation of the hydrogen corona with SPICAM on Mars Express” Icarus 195, 598-613.
Chaffin Michael S.
Chaufray J.
Schneider Nicholas
Stewart Iain
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