Exospheric density and escape fluxes of atomic isotopes on Venus and Mars

Details Exospheric density and escape fluxes of atomic isotopes on Venus and Mars Exospheric density and escape fluxes of atomic isotopes on Venus and Mars

Oct 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978p%26ss...26..949w&link_type=abstract

(International Association of Geomagnetism and Aeronomy, General Assembly, 3rd, Seattle, Wash., Aug. 22-Sept. 3, 1977.) Planetar

Computer Science

11

Atmospheric Composition, Exosphere, Mars Atmosphere, Neutral Particles, Venus Atmosphere, Atmospheric Density, Escape Velocity, Ion Recombination, Isotope Separation, Nitrogen Ions, Oxygen Ions, Venus, Mars, Density, Exosphere, Flux, Isotopes, Atmosphere, Oxygen, Velocity, Plasmas, Energy, Escape Flux, Nitrogen, Ions, Isotopic Ratios, Concentrations

Scientific paper

Energetic neutrals in dissociative recombinations near or above the exobase provide an important component of exospheric density and escape fluxes. Plasma thermal velocities provide the main contribution to the velocity spread; an exact integral for the escape flux applicable in marginal cases is found for a simple atmosphere and collisional cutoff. Atomic fragments from recombination of diatomic oxygen and nitrogen ions in the Venus and Mars atmospheres are examined, and density integrals derived. The oxygen escape flux on Mars is half that previously estimated, and there is very little isotope preference supplementing diffusive separation. However, escape of the heavier N-15 isotope is low by a factor of two. Reinterpretation of its 75% enrichment as detected by Viking leads to a range 0.4-1.4 mbar for the primeval nitrogen content on Mars.

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