Ionosphere of Venus - First observations of the effects of dynamics on the dayside ion composition

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Atmospheric Composition, Daytime, Ionospheric Sounding, Planetary Ionospheres, Solar Wind, Venus Atmosphere, Dynamic Response, Ionospheric Ion Density, Mass Spectroscopy, Molecular Ions, Pioneer Venus Spacecraft, Vertical Distribution, Observations, Dynamics, Ions, Mass Spectrometers, Solar Wind, Composition, Plasmas, Interactions, Thermal Properties

Scientific paper

Data obtained by Bennett radio-frequency ion mass spectrometers indicate that the ionosphere envelope, dominated above 200 km by O(+), responds dramatically to variations in the solar wind pressure. The pressure compresses the thermal ion distributions from heights as great as 1800 km inward to 280 km. At the thermal ion boundary, or ionopause, the ambient ions are swept away by the solar wind, while at higher altitudes energetic ion currents are detected. Within the ionosphere, ion convection stimulated by the solar wind interaction causes pass-to-pass differences in the ion scale heights.

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