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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Spatial localization of Langmuir waves generated from an electron beam propagating in an inhomogeneous plasma:Applications to the solar wind
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Spatial localization of Langmuir waves generated from an electron beam propagating in an inhomogeneous plasma:Applications to the solar wind

机译：空间定位的朗谬尔波生成在一个电子束传播非均匀等离子体:太阳能应用风

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摘要

It is known from in situ observations that large-amplitude spatially localized Langmuir waves are frequent in the solar wind, and usually correlated with the presence of suprathermal electron beams, during type III events or close to the electron foreshock. It seems that the influence of the solar wind density fluctuations on the propagation effects of the Langmuir waves play an important role in the formation of these wave packets. In this article, we focus on the mechanism of generation of localized wave packets by electron beams propagating in an inhomogeneous medium. To this purpose, we present a theoretical model based on the resolution of the high-frequency component of the Zakharov's equation in which a source term describing the electron beam has been introduced, and show that this model is able to reproduce classical results about beam plasma instability and wave trapping in density cavities. Then we present simulation results of the generation of Langmuir wave packets in typical solar wind conditions at I A.U., and discuss the origin and nature of their localization.
机译：众所周知从原位观测大幅度空间本地化的朗谬尔波中频繁的太阳风,通常与suprathermal的存在电子束,在类型III事件或关闭电子前震。太阳风密度波动的影响朗缪尔波传播的影响的形成起着重要的作用波包。代机制本地化波包通过电子束在非均匀传播媒介。模型基于的分辨率高频组件Zakharov的方程的源项描述介绍了电子束和显示这个模型能够再现经典的结果束等离子体不稳定性和波捕获在密度蛀牙。朗缪尔波的生成的结果我包在典型的太阳风条件A.U,并讨论他们的起源和本质本地化。

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