电子束准线性弛豫中粒子散射和模耦合引起的共振展宽
Resonance broadening due to particle scattering and mode-coupling in the quasi-linear relaxation of electron beams
摘要：
在太阳耀斑期间对加速电子的无线电和硬X射线诊断特别感兴趣的是对调节在湍流等离子体中传播的电子束的弛豫的基本非线性机制的理解。在这项工作中，它示出，除了散射的束电子，散射的束产生的朗缪尔波通过例如模式耦合，也可以导致在加宽的波粒共振。我们得到一个共振加宽版本的弱湍流理论与模式耦合到离子声模式。共振加宽在这里提出作为一个统一的框架，它可以定量地占减少和可能的抑制束不稳定性，由于背景散射的束电子本身或由于散射的束产生的朗缪尔波在波动的等离子体。共振展宽本质上等同于电子相空间分布的平滑，它被用来构建一个直观的物理图像，用于通常观察到的\emph{in-situ}在太阳风中传播的快电子反转粒子数的稳定性。
英文摘要：
Of particular interest for radio and hard X-ray diagnostics of accelerated electrons during solar flares is the understanding of the basic non-linear mechanisms regulating the relaxation of electron beams propagating in turbulent plasmas. In this work, it is shown that in addition to scattering of beam electrons, scattering of the beam-generated Langmuir waves via for instance mode-coupling, can also result in broadening of the wave-particle resonance. We obtain a resonance-broadened version of weak-turbulence theory with mode-coupling to ion-sound modes. Resonance broadening is presented here as a unified framework which can quantitatively account for the reduction and possible suppression of the beam instability due to background scattering of the beam electrons themselves or due to scattering of the beam-generated Langmuir waves in fluctuating plasmas. Resonance broadening being essentially equivalent to smoothing of the electron phase-space distribution, it is used to construct an intuitive physical picture for the stability of inverted populations of fast electrons that are commonly observed \emph{in-situ} to propagate in the solar-wind.
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