Incorporating Kinetic Physics into a Two-Fluid Solar-Wind Model with Temperature Anisotropy and Low-Frequency Alfven-Wave Turbulence

Abstract

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.

17 pages, 20 figures, accepted for publication in the Astrophysical Journal

References in corpus (14)

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• Spectral scaling laws in MHD turbulence simulations and in the solar wind
• Turbulence in the sub-Alfvénic solar wind driven by reflection of low-frequency Alfvén waves
• Frame Dependence of the Electric Field Spectrum of Solar Wind Turbulence
• Correlations between the proton temperature anisotropy and transverse high-frequency waves in the solar wind
• Weakly Turbulent MHD Waves in Compressible Low-Beta Plasmas

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• Parker Solar Probe: Four Years of Discoveries at Solar Cycle Minimum
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