Termination of the solar wind in the hot, partially ionized interstellar medium

Astronomy and Astrophysics – Astronomy

Scientific paper

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Interstellar Matter, Solar Wind, Astronomical Models, Flow Distribution, Magnetohydrodynamic Flow, Photoionization, Sun, Supersonic Flow

Scientific paper

It is suggested that a simple extention of an existing analytical model provides a useful approximate description of the combined solar wind, interstellar wind plasma flowfield under conditions thought to occur. A linear perturbation solution exhibiting both the effects of photoionization and charge exchange is obtained for the supersonic solar wind. Investigation of the one-dimensional compressible flow equation and heating associated with polytrope solutions brings to light evidence that the classical coefficients of thermal conductivity for an ionized gas may be too high to describe the flow of the supersonic solar wind beyond earth. A model for the combined flow of the solar wind with the ionized component of the interstellar wind is formulated on the level of one-fluid magnetohydrodynamics. The model features quasi-normal, strong shock relations on a closed surface surrounding the sun and imbedded in the solar wind.

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