Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-10-13
Astrophysical Journal, 743, 197 (2011)
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
17 pages, 20 figures, accepted for publication in the Astrophysical Journal
Scientific paper
10.1088/0004-637X/743/2/197
We develop a 1D solar-wind model that includes separate energy equations for the electrons and protons, proton temperature anisotropy, collisional and collisionless heat flux, and an analytical treatment of low-frequency, reflection-driven, Alfven-wave turbulence. To partition the turbulent heating between electron heating, parallel proton heating, and perpendicular proton heating, we employ results from the theories of linear wave damping and nonlinear stochastic heating. We account for mirror and oblique firehose instabilities by increasing the proton pitch-angle scattering rate when the proton temperature anisotropy exceeds the threshold for either instability. We numerically integrate the equations of the model forward in time until a steady state is reached, focusing on two fast-solar-wind-like solutions. These solutions are consistent with a number of observations, supporting the idea that Alfven-wave turbulence plays an important role in the origin of the solar wind.
Bale Stuart D.
Chandran Benjamin D. G.
Dennis Timothy J.
Quataert Eliot
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