Solar wind interaction with the ionosphere of Venus inferred from radio scintillation measurements

Physics

Scientific paper

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Planetary Ionospheres, Radio Probing, Scintillation, Solar Planetary Interactions, Solar Wind, Venus Atmosphere, Radio Transmission, Solar Cycles, Space Plasmas, Superhigh Frequencies, Ultrahigh Frequencies, Venus, Solar Wind, Interaction, Ionosphere, Radio Methods, Scintillation, Pvo Mission, Spacecraft Observations, Plasma, Origin, Formation, Density, Electrons, Ionopause, Magnetic Fields, Pressure, Comparisons, Diagrams, Calculations, Occultations

Scientific paper

The observation of S-band (2.3 GHz) radio scintillations in the ionosphere of Venus by the Pioneer Venus Orbiter is reported. In situ plasma measurements and propagation calculations show that the scintillations are caused by electron density irregularities in the topside ionosphere of Venus below the ionopause. It is suggested that these topside plasma irregularities are associated with the penetration of large-scale magnetic fields in the ionosphere. It is found that the disturbed plasma and the scintillations are a manifestation of high-dynamic solar wind interaction with the ionosphere.

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