Whistler instability stimulated by the suprathermal electrons present in space plasmas

摘要: In the absence of efficient collisions, deviations from thermal equilibrium plasma particle distributions are controlled by self-generated instabilities. The whistler instability is a notorious example, usually responsible for regulation electron temperature anisotropy $A = T_{\perp }/T_{\parallel }> 1$ (with $\perp , \parallel $ respective to magnetic field direction) observed in space plasmas, e.g., solar wind and planetary magnetospheres. Suprathermal electrons present these environments change dispersion stability properties, with expected consequences on kinetic instabilities resulting fluctuations, which, turn, scatter reduce their anisotropy. order capture mutual effects we use quasilinear approach PIC simulations, which provide comprehensive characterization under influence suprathermal electrons. Analysis performed large variety conditions, ranging low-beta plasmas encountered outer corona or magnetospheres high-beta characteristic heliospheric distances. Enhanced electrons, fluctuations stimulate relaxation anisotropy, this suprathermals increases beta parameter.