Whistler Waves Driven by Anisotropic Strahl Velocity Distributions: Cluster Observations
Whistler Waves Driven by Anisotropic Strahl Velocity Distributions: Cluster Observations
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各向异性斯特拉尔速度分布驱动的惠斯勒波：集群观测
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
M. Goldstein
中科院分区：
文献类型：
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作者：
A. F;C. Gurgiolo;T. Nieves;S. Gary;M. Goldstein
使用从 Cluster/PEACE 实验获得的高分辨率 3D 电子速度分布数据观察 strahl 的特性，用于研究其线性稳定性。使用一种自动化方法来隔离斯特拉尔，以允许其力矩的计算独立于太阳风核心+光环。结果表明，strahl具有较高的温度各向异性（T⊥/T‖≳2）。这种各向异性被证明是激发高频哨声波的重要自由能源。分析表明，由此产生的哨声波足够强大，可以通过俯仰角散射来调节太阳风中的电子速度分布。
Observed properties of the strahl using high resolution 3D electron velocity distribution data obtained from the Cluster/PEACE experiment are used to investigate its linear stability. An automated method to isolate the strahl is used to allow its moments to be computed independent of the solar wind core+halo. Results show that the strahl can have a high temperature anisotropy (T⊥/T‖≳2). This anisotropy is shown to be an important free energy source for the excitation of high frequency whistler waves. The analysis suggests that the resultant whistler waves are strong enough to regulate the electron velocity distributions in the solar wind through pitch‐angle scattering.