Advances in Fluid Modeling of the Solar Wind: Electron and Anisotropic Proton Temperatures from the Collisionless Dissipation of Alfven Wave Turbulence

Details Advances in Fluid Modeling of the Solar Wind: Electron and Anisotropic Proton Temperatures from the Collisionless Dissipation of Alfven Wave Turbulence Advances in Fluid Modeling of the Solar Wind: Electron and Anisotropic Proton Temperatures from the Collisionless Dissipation of Alfven Wave Turbulence

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh43a1921c&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH43A-1921

Physics

Plasma Physics

[7511] Solar Physics, Astrophysics, And Astronomy / Coronal Holes, [7827] Space Plasma Physics / Kinetic And Mhd Theory, [7863] Space Plasma Physics / Turbulence, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

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 model 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 also implement ``hard-wall'' limits to the proton temperature anisotropy corresponding to the thresholds of the mirror (or cyclotron) and oblique firehose instabilities. Using an implicit method, 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. However, our model under-predicts the perpendicular proton temperature at heliocentric distances less than 2 solar radii, suggesting that an additional source of heating is needed in the low corona.

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