Incorporating kinetic physics into a two-fluid solar-wind model with temperature anisotropy and low-frequency alfvn-wave turbulence

Benjamin D.G. Chandran, Timothy J. Dennis, Eliot Quataert, Stuart D. Bale

Research output: Contribution to journalArticle

104 Scopus citations

Abstract

We develop a one-dimensional 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, Alfvén-wave (AW) 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 AW turbulence plays an important role in the origin of the solar wind.

Original languageEnglish (US)
Article number197
JournalAstrophysical Journal
Volume743
Issue number2
DOIs
StatePublished - Dec 20 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Sun: corona
  • solar wind
  • turbulence
  • waves

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