The Interplay of the Solar Wind Core and Suprathermal Electrons: A Quasilinear Approach for Firehose Instability
The Interplay of the Solar Wind Core and Suprathermal Electrons: A Quasilinear Approach for Firehose Instability
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DOI：
10.3847/1538-4357/aaf72d
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发表时间：
2019-01
期刊：
影响因子：
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通讯作者：
S. M. Shaaban;M. Lazar;P. Yoon;S. Poedts
中科院分区：
文献类型：
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作者：
S. M. Shaaban;M. Lazar;P. Yoon;S. Poedts
在太阳风中，热能电子和超热电子之间很容易建立动能密度的均分，这两个群体的相互作用显着改变了不稳定性条件。这里导出的新阈值的周期性分支的消防水龙带不稳定性形状的温度各向异性的限制，两个电子人口的观察报告。这种不稳定性的约束是特别重要的超热电子，与热人口相比，甚至更少的粒子粒子碰撞控制。一个扩展的准线性的方法，这种不稳定性证实了从线性理论的预测，揭示了热和超热电子在其温度各向异性的松弛和增长的波动饱和的相互影响。
In the solar wind an equipartition of kinetic energy densities can be easily established between thermal and suprathermal electrons and the instability conditions are markedly altered by the interplay of these two populations. The new thresholds derived here for the periodic branch of firehose instability shape the limits of temperature anisotropy reported by observations for both electron populations. This instability constraint is particularly important for suprathermal electrons which, by comparison with thermal populations, are even less controlled by particle–particle collisions. An extended quasilinear approach to this instability confirms predictions from linear theory and unveils the mutual effects of thermal and suprathermal electrons in the relaxation of their temperature anisotropies and the saturation of growing fluctuations.