Comparison of dayside current layers in Venus' ionosphere and earth's equatorial electrojet

Details Comparison of dayside current layers in Venus' ionosphere and earth's equatorial electrojet Comparison of dayside current layers in Venus' ionosphere and earth's equatorial electrojet

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.3659c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A3, p. 3659-3667.

Physics

4

Earth Ionosphere, Electric Fields, Equatorial Electrojet, Ionospheric Currents, Planetary Ionospheres, Venus Atmosphere, Current Density, Geomagnetism, Magnetic Flux, Venus, Ionosphere, Magnetic Field, Comparisons, Dayside, Current, Layers, Earth, Equatorial Regions, Electrojet, Electrical Properties, Electric Field, Intensity, Pressure, Gravity Waves, Diffusion, Flux, Timescale, Velocity, Thickness, Calculations, Dynamo, Density, Energy, Momentum, Solar Wind, Electodynamics, Theoretical Studies

Scientific paper

The major physical aspects of the equatorial electrojet of Earth and the dayside ionospheric current layers of Venus are compared, viz., the electric current intensity and total current, roles of electric field, pressure and gravity, diffusion time scales, and the Bernouille effect. The largest potential differences, of the order of 10 volts, horizontally across the dayside ionosphere of Venus, have important implications for possible dynamo action in the Venus ionosphere and the application of an electric field from the lower atmosphere or from the solar wind. An upper limit to the horizontal scale of vertical magnetic fields in the Venus ionosphere is estimated thereby for the first time. New upper limits on the velocity in, and thickness of, a possible S layer at Venus are presented. If an S layer exists, it is only for extreme conditions of the solar wind. A mechanism for formation of magnetic ropes in the Venus ionosphere is also proposed.

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