电子双流不稳定性如何驱动周期性朗缪尔波崩溃和持续的相干辐射。
How electron two-stream instability drives cyclic Langmuir collapse and continuous coherent emission.
作者信息
Che Haihong, Goldstein Melvyn L, Diamond Patrick H, Sagdeev Roald Z
机构信息
Department of Astronomy, University of Maryland, College Park, MD 20742;
Heliospheric Physics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD 20771.
出版信息
Proc Natl Acad Sci U S A. 2017 Feb 14;114(7):1502-1507. doi: 10.1073/pnas.1614055114. Epub 2017 Jan 30.
Continuous plasma coherent emission is maintained by repetitive Langmuir collapse driven by the nonlinear evolution of a strong electron two-stream instability. The Langmuir waves are modulated by solitary waves in the linear stage and electrostatic whistler waves in the nonlinear stage. Modulational instability leads to Langmuir collapse and electron heating that fills in cavitons. The high pressure is released via excitation of a short-wavelength ion acoustic mode that is damped by electrons and reexcites small-scale Langmuir waves; this process closes a feedback loop that maintains the continuous coherent emission.
连续等离子体相干发射由强电子双流不稳定性的非线性演化驱动的重复朗缪尔崩塌维持。在线性阶段，朗缪尔波由孤立波调制，在非线性阶段由静电哨声波调制。调制不稳定性导致朗缪尔崩塌和电子加热，从而填充空穴子。高压通过激发短波离子声模释放，该模式被电子阻尼并重新激发小尺度朗缪尔波；这个过程闭合了一个维持连续相干发射的反馈回路。
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