Strongly-cooled ionizing plasma flows with application to Venus

Astronomy and Astrophysics – Astronomy

Scientific paper

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Magnetohydrodynamic Flow, Plasma Interactions, Solar Wind, Venus Atmosphere, Astronomical Models, Atmospheric Ionization, Atmospheric Models, Charge Transfer, Cold Plasmas, Cooling, Flow Equations, Gas Dynamics, Helium, Shock Waves

Scientific paper

On the solar wind's penetration into an atmosphere of hydrogen or helium, symmetric charge exchange interactions give energy and momentum losses as the dominant source terms in the flow equations. One-dimensional, supersonic to subsonic solutions are available if the cooling is strong enough. In a model with transverse field and adiabatic (non-thermal) ions, a range of weakly-shocked solutions with upstream mach number less than 2.5 are discovered. As in the case of detonation waves, the shock strength is independent of down-stream boundary conditions. The solutions may apply in the solar wind flow into the Venusian atmosphere.

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