Enhanced interaction of the solar wind and the interstellar neutral gas by virtue of a critical velocity effect

Details Enhanced interaction of the solar wind and the interstellar neutral gas by virtue of a critical velocity effect Enhanced interaction of the solar wind and the interstellar neutral gas by virtue of a critical velocity effect

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979stin...8114942p&link_type=abstract

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Physics

Plasma Physics

Critical Velocity, Electron Impact, Interstellar Gas, Neutral Gases, Plasma Physics, Solar Wind, Gas Density, Magnetohydrodynamics, Solar Protons, Space Plasmas

Scientific paper

Counterstreaming of a neutral gas and a magnetized plasma gives rise to strongly enhanced ionization of the neutral gas and consequent braking of the relative motion if a critical velocity is exceeded. By comparing characteristic parameters of laboratory experiments and of the solar wind, it is shown that this mechanism must also be operating in the interaction region of the solar wind and the interstellar medium. Implications for the heliospheric parameters are assessed by simultaneously solving the coupled continuity equations for the mass, the momentum and the energy of the solar wind protons, for the mass of the interstellar hydrogen, and for the number of hot electrons created by critical velocity effects. It is shown that the electrons of the outer solar wind can be effectively prevented from adiabatically cooling to nonionizing energies. A considerably stronger deceleration of the solar wind, a weaker radial decrease of its density, and a steeper radial increase of the outer solar wind proton temperature and the interstellar gas density are obtained than are calculated from photoionization and charge exchange alone.

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