Effects of suprathermal electrons on electron-acoustic instabilities
arXiv:2211.08768 · doi:10.3389/fspas.2022.1030557
Abstract
We study the electron-acoustic instabilities in plasmas with two kappa-distributed electrons and stationary ions. The instabilities are driven by the relative drift between two electron components. The suprathermal effects of different species on growth rates and instability thresholds are analyzed and compared by numerical calculations. The present study reveals that the suprathermal electrons with slow most probable speed play more important roles than the suprathermal ones with fast most probable speed. The former significantly reduces the instabilities and raises the instability thresholds. The parameters used in this study are inspired from the observations in Earth's magnetopause.
12 pages, 6 figures, accepted by Frontiers in Astronomy and Space Sciences
References in corpus (6)
- On the Relation between Kappa Distribution Functions and the Plasma Beta Parameter in the Earth Magnetosphere: THEMIS observations
- Transport coefficients of the fully ionized plasma with kappa-distribution and in strong magnetic field
- The electron acoustic waves in plasmas with two kappa-distributed electrons at the same temperatures and immobile ions
- The collision frequency of electron-neutral-particle in the weakly ionized plasmas with Non-Maxwellian velocity distributions
- Stationary states of polytropic plasmas
- Transport coefficients enhanced by suprathermal particles in nonequilibrium heliospheric plasmas