Beaming electromagnetic (or heat-flux) instabilities from the interplay with the electron temperature anisotropies

Abstract

In space plasmas kinetic instabilities are driven by the beaming (drifting) components and/or the temperature anisotropy of charged particles. The heat-flux instabilities are known in the literature as electromagnetic modes destabilized by the electron beams (or strahls) aligned to the interplanetary magnetic field. A new kinetic approach is proposed here in order to provide a realistic characterization of heat-flux instabilities under the influence of electrons with temperature anisotropy. Numerical analysis is based on the kinetic Vlasov-Maxwell theory for two electron counter-streaming (core and beam) populations with temperature anisotropies, and stationary, isotropic protons. The main properties of electromagnetic heat-flux instabilities are found to be markedly changed by the temperature anisotropy of electron beam $A_b=T_{\perp }/T_{\parallel }\ne 1$, leading to stimulation of either the whistler branch if $A_b>1$, or the firehose branch for $A_b<1$. For a high temperature anisotropy whistlers switch from heat-flux to a standard regime, when their instability is inhibited by the beam.

arXiv commentaccepted for publication in Physics of Plasmas

References in corpus (4)

• Whistler mode waves and the electron heat flux in the solar wind: Cluster observations
• The Electron Temperature and Anisotropy in the Solar Wind. I. Comparison of the Core and Halo Populations
• Clarifying the solar wind heat-flux instabilities
• Electron Firehose instability and acceleration of electrons in solar flares

Cited by in corpus (16)

• Self-induced Scattering of Strahl Electrons in the Solar Wind
• Alternative high plasma beta regimes of electron heat-flux instabilities in the solar wind
• Plasma Waves near the Electron Cyclotron Frequency in the near-Sun Solar Wind
• On the role of solar wind expansion as a source of whistler waves: scattering of suprathermal electrons and heat flux regulation in the inner heliosphere
• Quasilinear Approach of the Whistler Heat-Flux Instability in the Solar Wind
• On the entropy of plasmas described with regularized $\kappa$-distributions
• On quasi-parallel whistler waves in the solar wind
• Quasilinear approach of the cumulative whistler instability in fast solar winds: Constraints of electron temperature anisotropy
• Particle-in-cell simulations of the whistler heat-flux instability in the solar wind conditions
• 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
• Electron Firehose Instabilities in High-$\beta$ ICM shocks
• The aperiodic firehose instability of counter-beaming electrons in space plasmas
• Comparing the counter-beaming and temperature anisotropy driven aperiodic electron firehose instabilities in collisionless plasma environments
• Heat-flux Instabilities of Regularized Kappa Distributed Strahl Electrons Resolved with ALPS