The Interplay of the Solar Wind Core and Suprathermal Electrons: A Quasilinear Approach for Firehose Instability

Abstract

In the solar wind an equipartition of kinetic energy densities can be easily established between thermal and suprathermal electrons and the instability conditions are markedly altered by the interplay of these two populations. The new thresholds derived here for the periodic branch of firehose instability shape the limits of temperature anisotropy reported by the observations for both electron populations. This instability constraint is particularly important for the suprathermal electrons which, by comparison to thermal populations, are even less controlled by the particle-particle collisions. An extended quasilinear approach of this instability confirms predictions from linear theory and unveil the mutual effects of thermal and suprathermal electrons in the relaxation of their temperature anisotropies and the saturation of growing fluctuations.

arXiv commentApJ in press

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• Quasilinear approach of the cumulative whistler instability in fast solar winds: Constraints of electron temperature anisotropy
• Electron Temperature Anisotropy and Electron Beam Constraints From Electron Kinetic Instabilities in the Solar Wind
• Electromagnetic Ion-Ion Instabilities in Space Plasmas: Effects of Suprathermal Populations
• Whistler instabilities from the interplay of electron anisotropies in space plasmas: A quasilinear approach
• A new low-beta regime for unstable proton firehose modes in bi-Kappa distributed plasmas
• Particle-In-Cell simulations of the parallel proton firehose instability influenced by the electron temperature anisotropy in solar wind conditions
• On the interplay of solar wind proton and electron instabilities: Linear and quasi-linear approaches
• Decoding the formation of hammerhead ion populations observed by Parker Solar Probe
• Numerical simulations of temperature anisotropy instabilities stimulated by suprathermal protons
• Comparing the counter-beaming and temperature anisotropy driven aperiodic electron firehose instabilities in collisionless plasma environments