Electron Heat Flux Instabilities in the Inner Heliosphere: Radial Distribution and Implication on the Evolution of the Electron Velocity Distribution Function

This Letter investigates the electron heat flux instability using the radial models of the magnetic field and plasma parameters in the inner heliosphere. Our results show that both the electron acoustic wave and the oblique whistler wave are unstable in the regime with large relative drift speed (Delta V ( e )) between electron beam and core populations. Landau-resonant interactions of electron acoustic waves increase the electron parallel temperature that would lead to suppressing the electron acoustic instability and amplifying the growth of oblique whistler waves. Therefore, we propose that the electron heat flux can effectively drive oblique whistler waves in an anisotropic electron velocity distribution function. This study also finds that lower-hybrid waves and oblique Alfven waves can be triggered in the solar atmosphere, and that the former instability is much stronger than the latter. Moreover, we clarify that the excitation of lower-hybrid waves mainly results from the transit-time interaction of beaming electrons with resonant velocities v (parallel to) similar to omega/k (parallel to), where omega and k (parallel to) are the wave frequency and parallel wavenumber, respectively. In addition, this study shows that the instability of quasi-parallel whistler waves can dominate the regime with medium Delta V ( e ) at the heliocentric distance nearly larger than 10 times of the solar radius.

Automated summary

This study investigates the electron heat flux instability in the inner heliosphere, finding that both electron acoustic waves and oblique whistler waves are unstable under conditions of large relative drift speed. It is proposed that electron heat flux can effectively drive oblique whistler waves in anisotropic electron velocity distribution. Additionally, lower-hybrid waves are observed to be stronger than oblique Alfven waves in the solar atmosphere.