Deuterium on Venus - Model comparisons with Pioneer Venus observations of the predawn bulge ionosphere

Details Deuterium on Venus - Model comparisons with Pioneer Venus observations of the predawn bulge ionosphere Deuterium on Venus - Model comparisons with Pioneer Venus observations of the predawn bulge ionosphere

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...62..494k&link_type=abstract

Icarus (ISSN 0019-1035), vol. 62, June 1985, p. 494-504.

Computer Science

10

Deuterium, Ionospheric Composition, Ionospheric Ion Density, Venus Atmosphere, Atmospheric Chemistry, Night Sky, Pioneer Venus Spacecraft, Positive Ions, Self Consistent Fields, Venus, Deuterium, Models, Comparisons, Pioneer Venus, Observations, Pvo, Ionosphere, Structure, Ion Mass Spectrometer, Spectrometry, Orbiters, Homopause, Mass, Ions, Density, Hydrogen, Mixing Ratios, Altitude

Scientific paper

A model of the predawn bulge ionosphere composition and structure is constructed and compared with the ion mass spectrometer measurements from the Pioneer Venus Orbiter during orbits 117 and 120. Particular emphasis is given to the identification of the mass-2 ion which the authors find unequivocally due to D+ (and not H2+). The atmospheric D/H ratio of 1.4% and 2.5% is obtained at the homopause (≡130 km) for the two orbits. The H2+ contribution to the mass-2 ion density is less than 10%, and the H2 mixing ratio must be <0.1 ppm at 130 km altitude. The He+ data require a downward He+ flux of ≡2×107cm-2sec-1 in the predawn region which suggests that the light ions also flow across the terminator from day to night along with the observed O+ ion flow.

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