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Observed instability constraints on electron heat flux in the solar wind
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We present for the first time the joint distribution of electron heat flux and electron plasma beta, and the joint distribution of core electron drift velocity and electron plasma beta using a statistically large dataset of solar wind electrons at 1AU. We calculate the growth rates of linear instabilities and show compelling experimental evidence that the heat-flux-driven Alfv{\'e}n instabilities constrain the electron core drift, and therefore the electron heat flux, in low-beta plasmas. This result is relevant to understanding energy transport in low-beta solar/stellar coronae and winds.
Forward citations
Cited by 2 Pith papers
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Particle-in-cell simulations of the whistler heat-flux instability in the solar wind conditions
First PIC simulations capture the whistler heat-flux instability and show its saturation by reduced electron drifts and induced temperature anisotropies.
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Scattering of energetic electrons by heat-flux-driven whistlers in flares
In a flare-like 2D particle-in-cell simulation, heat-flux-driven oblique whistler waves pitch-angle scatter energetic electrons on a timescale of about 100 cyclotron periods, suppressing their heat flux.
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