Physics
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9810833h&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. E6, p. 10,833-10,838.
Physics
15
Exosphere, Hydrogen Isotopes, Isotope Separation, Planetary Ionospheres, Venus Atmosphere, Fractionation, Gas-Ion Interactions, Oxygen Atoms, Velocity Distribution, Planets, Venus, Isotopes, Fractionation, Hydrogen, Exosphere, Escape, Ionosphere, Coupling, Deuterium, Temperature, Neutral Particles, Ions, Parameters, Oxygen, Ejection, Collisions, Charge Exchange, Hypotheses, Calculations, Momentum, Production Rate, Velocity, Distribution, Nightside
Scientific paper
The paper considers isotopic hydrogen fractionation processes in the Venusian exosphere due to ionosphere-exosphere coupling by addressing two deficiencies in the present theory of differential escape. First, a set of D/H isotopic fractionation curves is derived for the ion-neutral interactions of charge and collisional momentum transfer, and these are compared with the results of Gurwell and Yung (1993) for hot O collisional ejection. Then, the question of the relative importance of collisional ejection in atmospheric escape is reexamined using two simple exosphere models. It is shown that O-O collisions suppress the high energy component of the hot O distribution by more than a factor of 10. Moreover, the ballistic trajectories of fast O atoms that reach the nighttime reservoir of exospheric hydrogen favor downward scatter of D and H rather than their escape. It is concluded that, due to severe limits placed on the effectiveness of collisional ejection, the differential escape of D and H from Venus is determined by charge exchange interactions rather than the collisional ejection.
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