Acceleration of the high speed solar wind.

Astronomy and Astrophysics – Astrophysics

Scientific paper

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126

Sun: Corona, Solar Wind

Scientific paper

A theory is developed for the high speed solar wind based on a simple dissipation length characterization of wave heating of the coronal plasma close to the Sun. It is shown that solutions with the correct particle and energy fluxes and with a realistic magnetic field, match the requirements on the density at the base of the corona provided the dissipation length is relatively small (~0.25-0.5 solar radii). The significant features of these solutions are that the acceleration is rapid, with the sonic point at about 2 solar radii, and the maximum proton temperatures are high, namely 8-10x10^6^K, which could be consistent with some recent observations. Such efficient dissipation requires any Alfven waves responsible to have frequencies in the range 0.01Hz-10kHz. This has implications for the nature of the plasma and energy source in the chromospheric network.

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