Physics
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...104.8463h&link_type=abstract
Journal of Geophysical Research, Volume 104, Issue E4, p. 8463-8472
Physics
6
Planetology: Solar System Objects: Venus
Scientific paper
Data from Pioneer Venus provide a basis for estimating current escape rates of H and D from Venus, but there is no consensus in the existing estimates. In an attempt to clarify the effects of exospheric dynamics on escape, models of the distributions of H and D in the upper thermosphere and exosphere of Venus, and mutually consistent distributions of H+ and D+, have been calculated for several scenarios at solar maximum. The model results indicate that the combined (neutral and ion) planet average escape fluxes for H and D are 4.7×107cm-2s-1 and 1.4×105cm-2s-1, respectively. Allowing for uncertainties in the modeling procedure, the exospheric escape flux of H is inexplicably greater than current estimates of its thermospheric counterpart derived from Hunten's limiting flux theorem.
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