The dynamic behavior of the Venus ionosphere in response to solar wind interactions

Physics

Scientific paper

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Venus, Pvo Mission, Spacecraft Observations, Ionosphere, Solar Wind, Electrons, Density, Temperature, Oetp Instrument, Ionosheath, Pressure, Magnetic Fields, Ionopause, Nightside, Dayside, Ions, Pickup, Plasma, Hypotheses, Diagrams, Altitude, Stratification, Gradients, Dynamics

Scientific paper

The dynamics of the Venus ionosphere relates to the variations in the solar wind and the ionosheath magnetic fields as demonstrated by the electron density and temperature measurements of the Pioneer Venus orbiter electron probe. The mean ionopause height increases from 330 km at the subsolar point to 700 km at the dusk terminator, and to 1000 km at the dawn terminator; the dayside ionopause expands and contracts with solar wind pressure variations. Extreme spatial irregularities in the shape of holes, horizontally stratified layers, and detached plasma clouds are observed in the nightside ionosphere. The ion pickup on the dayside is described in terms of solar wind discontinuities inducing a wavelike pattern at the ionopause which is penetrated by the ionosheath plasma and magnetic fields which remove the plasma in the form of detached plasma clouds.

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