Ion dynamics in the Venus ionosphere

Details Ion dynamics in the Venus ionosphere Ion dynamics in the Venus ionosphere

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ssrv...55..165m&link_type=abstract

Space Science Reviews (ISSN 0038-6308), vol. 55, Jan.-Feb. 1991, p. 165-199. Research supported by Lockheed Independent Research

Computer Science

34

Atmospheric Ionization, Planetary Ionospheres, Solar Planetary Interactions, Solar Wind, Venus Atmosphere, Diurnal Variations, Ionic Mobility, Ionopause, Ionospheric Ion Density, Magnetohydrodynamic Flow, Plasma Pressure, Transonic Flow, Venus, Ionosphere, Ions, Dynamics, Ionization, Pressure Gradient, Flow, Plasma, Photoionization, Dayside, Oxygen, Source, Models, Velocity, Symmetry, Rotation, Altitude, Ionopause, Solar Wind, Nightside, Chaos, Shock Wave, Diameter, Calculations, Parameters, Theoretical Stu

Scientific paper

Measurement data on the ion velocity in the Venus ionosphere (mainly from the Pioneer Venus Orbiter Retarding Potential Analyzer) are summarized, and theoretical models developed to explain them are reviewed. Data and theoretical predictions are compared in extensive graphs and diagrams and discussed in detail. It is shown that the predominant flow is away from the subsolar point, at up to 3 km/sec in the terminator region. A model of axisymmetric flow based on momentum, energy, and mass conservation laws is found to reproduce the observed ion velocities at solar zenith angles less than about 140 deg, but not the high velocities and chaotic behavior seen near the antisolar point. Also discussed are significant differences between the flow above and below about 400 km and the effects of changes in the dynamic pressure of the solar wind.

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