Theory of three-wave parametric instabilities in inhomogeneous plasmas revisited
Theory of three-wave parametric instabilities in inhomogeneous plasmas revisited
复制标题
重新审视非均匀等离子体中的三波参数不稳定性理论
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
A. Simon
中科院分区：
文献类型：
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作者：
R. Short;A. Simon
本文重新研究了非均匀介质中三波参量不稳定性的著名理论。一个解析形式得到的绿色的函数响应的初始δ函数脉冲，这使得更精细的评估其属性和更大的设施，在使用它来模拟现实的初始条件。最重要的是，我们发现物理上真实的初始脉冲的行为与基于奇异δ函数结果所预期的完全不同，而更符合均匀等离子体对流不稳定性理论所预期的雅阁。
The well-known theory of three-wave parametric instabilities in an inhomogeneous medium is reexamined. An analytic form is obtained for the Green’s function response to an initial δ-function pulse, which allows a more refined assessment of its properties and greater facility in employing it to model realistic initial conditions. Most significantly, it is found that physically realistic initial pulses behave quite differently than would be expected on the basis of the singular δ-function result, and more in accord with what would be expected from the theory of convective instabilities in homogeneous plasmas.