The ancient oxygen exosphere of Mars - Implications for atmosphere evolution

Details The ancient oxygen exosphere of Mars - Implications for atmosphere evolution The ancient oxygen exosphere of Mars - Implications for atmosphere evolution

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9810915z&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. E6, p. 10,915-10,923.

Physics

67

Exosphere, Ion Production Rates, Mars Atmosphere, Oxygen Atoms, Planetary Evolution, Atmospheric Models, Extreme Ultraviolet Radiation, Planetary Ionospheres, Mars, Oxygen, Exosphere, Atmosphere, Evolution, Escape, Ions, Pickup, Radiation, Intensity, Solar Effects, Temperature, Photoionization, Flux, Calculations, Model, Density, Ionosphere, Wavelength, Ultraviolet, Production Rate, Water, Charge Exchange, Solar Wind, Electrons, Impacts, Timescale, Parameters

Scientific paper

The paper considers absorption of oxygen (atoms and ions) by the surface as a mechanism for the early Martian atmosphere escape, due to the effect of high EUV flux of the ancient sun. Hot oxygen exosphere densities in ancient atmosphere and ionosphere are calculated for different EUV fluxes and the escape fluxes associated with these exposures. Using these densities, the ion production rate above the ionopause is calculated for different epochs including photoionization, charge exchange, and solar wind electron impact. It is found that, when the inferred high solar EUV fluxes of the past are taken into account, oxygen equivalent to that in several tens of meters of water, planet-wide, should have escaped Martian atmosphere to space over the last 3 Gyr.

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