Multi-Species Measurements of the Firehose and Mirror Instability Thresholds in the Solar Wind

Abstract

The firehose and mirror instabilities are thought to arise in a variety of space and astrophysical plasmas, constraining the pressure anisotropies and drifts between particle species. The plasma stability depends on all species simultaneously, meaning that a combined analysis is required. Here, we present the first such analysis in the solar wind, using the long-wavelength stability parameters to combine the anisotropies and drifts of all major species (core and beam protons, alphas, and electrons). At the threshold, the firehose parameter was found to be dominated by protons (67%), but also to have significant contributions from electrons (18%) and alphas (15%). Drifts were also found to be important, contributing 57% in the presence of a proton beam. A similar situation was found for the mirror, with contributions of 61%, 28%, and 11% for protons, electrons, and alphas, respectively. The parallel electric field contribution, however, was found to be small at 9%. Overall, the long-wavelength thresholds constrain the data well (<1% unstable), and the implications of this are discussed.

References in corpus (12)

• Magnetic fluctuation power near proton temperature anisotropy instability thresholds in the solar wind
• Firehose and Mirror Instabilities in a Collisionless Shearing Plasma
• Incorporating Kinetic Physics into a Two-Fluid Solar-Wind Model with Temperature Anisotropy and Low-Frequency Alfven-Wave Turbulence
• Shearing Box Simulations of the MRI in a Collisionless Plasma
• Predicted Impacts of Proton Temperature Anisotropy on Solar Wind Turbulence
• Nonlinear growth of firehose and mirror fluctuations in turbulent galaxy-cluster plasmas
• Inertial-Range Kinetic Turbulence in Pressure-Anisotropic Astrophysical Plasmas
• Ensemble Simulations of Proton Heating in the Solar Wind via Turbulence and Ion Cyclotron Resonance
• Limits on Alpha Particle Temperature Anisotropy and Differential Flow from Kinetic Instabilities: Solar Wind Observations
• A Parallel-Propagating Alfvénic Ion-Beam Instability in the High-Beta Solar Wind
• Self-Consistent Ion Cyclotron Anisotropy-Beta Relation for Solar Wind Protons
• Proton temperature anisotropy and magnetic reconnection in the solar wind: effects of kinetic instabilities on current sheet stability

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