A model for chorus associated electrostatic bursts
A model for chorus associated electrostatic bursts
复制标题
合唱相关静电爆发的模型
DOI：
10.1029/ja089ia02p00919
复制
发表时间：
1984
影响因子：
--
通讯作者：
C. Grabbe
中科院分区：
文献类型：
--
作者：
C. Grabbe
本文对有限温度电子束和麦克斯韦电子及离子背景，发展了电子在合唱波包中产生静电噪声猝发的线性理论。定性确定的增长率与以前的作者从一个更理想化的模型中获得的良好协议。两种相关的不稳定机制似乎正在发生：束等离子体（电子-离子双流）不稳定性通常与合唱功率水平的增强相关，以及过渡或边缘电阻介质不稳定性通常与合唱钩相关。讨论了这两种机制的物理原因。在第二种情况下，电子束很难在粒子数据中识别。最大增长率的表达式中获得的束和电子的热速度的比的束速度，和束密度等离子体密度。预期这可允许将静电噪声谱中的所观察到的峰值用作对射束特性的诊断。之前在星星上宣布为N84-12832
The linear theory of the generation of electrostatic bursts of noise by electrons trapped in chorus wave packets is developed for a finite temperature electron beam and a Maxwellian elecron and ion background. The growth rates determined qualitatively in good agreement with those obtained by previous authors from a more idealized model. Two connected instability mechanisms seem to be occurring: a beam plasma (electron-ion two-stream) instability commonly associated with intensification of the chorus power levels, and a transitional or borderline resistive medium instability commonly associated with chorus hooks. The physical reasons for the two mechanisms is discussed. In the second case electron beams are difficult to identify in the particle data. An expression is obtained for the maximum growth rate in terms of the ratios of the beam and electron thermal velocities to the beam velocity, and of the beam density to plasma density. It is anticipated that this may allow the observed peak in the electrostatic noise spectrum to be used as a diagnostic for the beam characteristics. Previously announced in STAR as N84-12832