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• W3105604040 endingPage "L8" @default.
• W3105604040 startingPage "L8" @default.
• W3105604040 abstract "In collision-poor plasmas from space, e.g., solar wind or stellar outflows, the heat flux carried by the strahl or beaming electrons is expected to be regulated by the self-generated instabilities. Recently, simultaneous field and particle observations have indeed revealed enhanced whistler-like fluctuations in the presence of counter-beaming populations of electrons, connecting these fluctuations to the whistler heat-flux instability (WHFI). This instability is predicted only for limited conditions of electron beam-plasmas, and has not yet been captured in numerical simulations. In this Letter we report the first simulations of WHFI in particle-in-cell setups, realistic for the solar wind conditions, and without temperature gradients or anisotropies to trigger the instability in the initiation phase. The velocity distributions have a complex reaction to the enhanced whistler fluctuations conditioning the instability saturation by a decrease of the relative drifts combined with induced (effective) temperature anisotropies (heating the core electrons and pitch-angle and energy scattering the strahl). These results are in good agreement with a recent quasilinear approach, and support therefore a largely accepted belief that WHFI saturates at moderate amplitudes. In the anti-sunward direction the strahl becomes skewed with a pitch-angle distribution decreasing in width as electron energy increases, which seems to be characteristic of self-generated whistlers and not to small-scale turbulence." @default.
• W3105604040 created "2020-11-23" @default.
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• W3105604040 date "2019-09-03" @default.
• W3105604040 modified "2023-10-06" @default.
• W3105604040 title "Particle-in-cell Simulations of the Whistler Heat-flux Instability in Solar Wind Conditions" @default.
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• W3105604040 doi "https://doi.org/10.3847/2041-8213/ab398b" @default.
• W3105604040 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7008930" @default.
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