Physics – Geophysics
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981p%26ss...29..635c&link_type=abstract
Planetary and Space Science, vol. 29, June 1981, p. 635-652.
Physics
Geophysics
18
Atmospheric Models, Electrodynamics, Ionospheric Currents, Planetary Ionospheres, Planetary Magnetic Fields, Plasma Interactions, Venus Atmosphere, Interplanetary Magnetic Fields, Kelvin-Helmholtz Instability, Magnetic Field Configurations, Magnetic Variations, Magnetohydrodynamic Stability, Pioneer Venus 1 Spacecraft, Solar Wind, Venus, Dayside, Ionosphere, Magnetic Fields, Electrodynamics, Models, Electric Fields, Solar Wind, Plasmas, Shear, Observations, Velocity, Magnetohydrodynamics, Interplanetary Mag
Scientific paper
The electric current configuration induced in the ionosphere of Venus by the interaction of the solar wind has been calculated in previous papers (Cloutier and Daniell, 1973; Daniell and Cloutier, 1977; Cloutier and Daniell, 1979) for average steady-state solar wind conditions and interplanetary magnetic field. This model is generalized to include the effects of (1) plasma depletion and magnetic field enhancement near the ionopause, (2) velocity-shear-induced MHD instabilities of the Kelvin-Helmholtz type within the ionosphere, and (3) variations in solar wind parameters and interplanetary magnetic field. It is shown that the magnetic field configuration resulting from the model varies in response to changes in solar wind and interplanetary field conditions, and that these variations produce magnetic field profiles in excellent agreement with those seen by the Pioneer-Venus Orbiter. The formation of flux-ropes by the Kelving-Helmholtz instability is shown to be a natural consequence of the model, with the spatial distribution and size of the flux-ropes determined by the magnetic Reynolds number.
Cloutier Paul A.
Daniell Robert E.
Tascione Thomas F.
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