Abstract
Abstract. It is shown that core-strahl electron system in the solar wind plasma is unstable with respect to excitation of the lower hybrid waves at anomalous Doppler resonance due to anisotropy of the strahl electron velocity distribution. Dynamics of the strahl electron distribution due to interaction with excited waves is studied.
Highlights
Observations have revealed that the solar wind electron distribution can be considered to consist of a dense core component and more tenuous suprathermal population
In second mechanism the electron distribution function is mainly determined by the electric ambipolar field and the expanding geometry and consists of a population with almost isotropic core which is bound in the electrostatic potential and a high-energy tail of the electron distribution that can stream freely outward in the corona (Lie-Svendsen et al, 1997)
There is no positive slope at the initial electron distribution function over parallel velocity, the strahl electrons have an anisotropic distribution that is unstable with respect to excitation of lower hybrid waves that leads to effective pitch-angle diffusion of the strahl electrons
Summary
Observations have revealed that the solar wind electron distribution can be considered to consist of a dense core component and more tenuous suprathermal population. The physical mechanisms of the strahl origin were investigated in theoretical studies of the evolution of the electron velocity distribution function in high speed solar wind streams from the collision-dominated corona and into the collisionless interplanetary space. It was shown that the strahl component can develop in the high corona as a result of two possible mechanisms. In second mechanism the electron distribution function is mainly determined by the electric ambipolar field and the expanding geometry and consists of a population with almost isotropic core which is bound in the electrostatic potential and a high-energy tail of the electron distribution that can stream freely outward in the corona (Lie-Svendsen et al, 1997)
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