Physics
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...10126911s&link_type=abstract
Journal of Geophysical Research, Volume 101, Issue A12, p. 26911-26920
Physics
10
Ionosphere: Planetary Ionospheres, Ionosphere: Ionosphere/Magnetosphere Interactions, Ionosphere: Plasma Convection, Magnetospheric Physics: Solar Wind Interactions With Unmagnetized Bodies
Scientific paper
A two-dimensional model of the ionosphere of Venus under unmagnetized conditions has been developed in order to study the processes of horizontal plasma transport. The continuity and momentum equations are solved self-consistently, using the observed plasma temperatures. It is found that the vertical velocity is upward (~10m/s) at high altitudes (z>240km) in the dayside ionosphere. Below 240 km, on the other hand, the vertical velocity is downward and is basically the same as that obtained by one-dimensional models. The results suggest that the nightside ionosphere can be maintained by day-to-night plasma transport, as was suggested by previous studies. It is also shown that the horizontal pressure gradient forces are sufficient to produce the observed acceleration of ionospheric plasma at least under some conditions. However, the results do not rule out the possibility that the solar wind momentum is transported to the ionosphere, which drives the day-to-night flow in the Venus ionosphere.
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