The strahl electrons as a source of electrostatic whistler waves in the solar wind turbulence

Physics – Plasma Physics

Scientific paper

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[7839] Space Plasma Physics / Nonlinear Phenomena, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

According to observations, the solar wind electron distribution consists of a dense core component (95% of the total electron density) and the suprathermal population (5%) that consists of halo with Maxwellian distribution with hotter temperature and of so-called strahl with a narrow pitch angle distribution directed along the magnetic field in anti-sunward direction. This distribution can be unstable with regards to excitation of lower hybrid waves at anomalous Doppler resonance when the energy source of instability is parallel motion of electrons [1]. We numerically simulated the nonlinear dynamics of instability in local approximation by using a hybrid method on resonant numeric simulations. The dynamics of wave power spectrum as well as the strahl distribution function were studied for different distribution function over parallel velocities of strahl electrons. The halo formation is discussed. [1] Shevchenko V., and V. Galinsky, Nonliinear Processes in Geophys. (submitted), 2010.

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