Transition to subsonic streaming in nonlinear model for galactic cosmic ray modulation by solar wind

Physics

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Galactic Cosmic Rays, Interstellar Gas, Plasma Interactions, Solar Wind Velocity, Interstellar Magnetic Fields, Modulation, Subsonic Flow, Transition Layers

Scientific paper

The transition of solar wind to subsonic streaming is examined in a nonlinear self-consistent model including the effect of galactic cosmic rays on solar wind propagation with simultaneous allowance for the change of solar wind velocity due to charge exchange with neutral hydrogen. The solar wind and the cosmic rays are treated as two mutually penetrating gases. The rate of solar wind momentum change in unit volume due to interactions with galactic cosmic rays is determined by the cosmic ray pressure gradient. The influx of momentum and energy due to low-energy proton supply to solar plasma is neglected. A condition for a shock-free transition to subsonic streaming is found whose actual realization is scarcely possible.

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