Planetary loss from light ion escape on Venus

Details Planetary loss from light ion escape on Venus Planetary loss from light ion escape on Venus

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..15..117h&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 15, no. 4, p. (4)117-(4)122

Mathematics

13

Deuterium, Hydrogen, Mathematical Models, Planetary Ionospheres, Polarization (Charge Separation), Venus (Planet), Water, Density Distribution, Ions, Particle Acceleration, Pioneer Venus 1 Spacecraft

Scientific paper

Using Pioneer Venus data, hydrogen and deuterium ions are shown to escape from the hydrogen bulge region in the nightside ionosphere. The polarization electric field propels these light ions upward through the ionosphere and into the ion-exosphere, where H(+) and D(+) continue to be accelerated away from Venus and move into the ionotail and beyond. The vertical flow speeds of H(+) and D(+) are found to be about the same; therefore, selective escape between H(+) and D(+) is negligible for this mechanism. Present day planetary loss rates of about 8.6 x 1025/s and 3.2 X 1023/s were obtained for H(+) and D(+), respectively. Such rates, persisting over a few billion years, should have significantly affected the planetary water budget.

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