Formation of the plasma mantle in the Venusian magnetosphere

Physics

Scientific paper

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Planetary Magnetospheres, Plasma Interactions, Solar Planetary Interactions, Space Plasmas, Venus Atmosphere, Convective Flow, Ion Motion, Ionopause, Magnetic Effects, Solar Wind, Venus, Magnetosphere, Plasmas, Mantle, Formation, Models, Interaction, Solar Wind, Ionopause, Structure, Dynamics, Wakes, Magnetotails, Ions, Convection, Pressure, Gradients, Flux Tubes, Source, Comparisons, Velocity, Thickness, Physical Properties, Density, Strength, Dayside, Anomalies, Ionization, Ionosphere, Calculations, Diagr

Scientific paper

A model of the interaction of the solar wind with Venus is proposed including magnetic barrier formation, ionopause structure, plasma dynamics in the magnetic barrier, and the formation of the Venusian tail (wake). It is shown that under stationary conditions the ionopause is practically an equipotential boundary and its current is determined by a diamagnetic drift. The source of the plasma mantle can be provided by photoions appearing in the magnetic barrier and convecting toward the wake as a result of both magnetic pressure gradient and magnetic tension. The formation of the magnetic tail is determined by convection of magnetic barrier flux tubes in which the solar-wind plasma is replaced by ions of planetary origin. Compared to observational data the proposed model gives somewhat overestimated values of ion convective velocity and magnetic barrier thickness near the terminator and underestimated values of number density and magnetic field strength in the tail. Accordingly this suggests the possible influence of the anomalous ionization effects in the solar wind-Venus interaction.

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