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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Inhibition of type III radio emissions due to the interaction between two electron beams: Observations and simulations
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Inhibition of type III radio emissions due to the interaction between two electron beams: Observations and simulations

机译：抑制类型III广播由于排放两个电子束之间的交互:观测和模拟

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摘要

We report the peculiar interaction of two type III bursts observed in the solar wind. As electron beams propagating on the same magnetic field lines cross, a spectacular depletion of the type III radio emission is observed. We combine observations from the WAVES experiment on board the STEREO mission together with kinetic plasma simulations to study the extinction of type III radio emission resulting from the interaction between two electron beams. The remote observations enable to follow the electron beams in the interplanetary medium and show that the level of radiated radio waves is recovered after the beam crossing. The in situ observations of beam-driven Langmuir waves give evidence for Langmuir decay. The density fluctuations are extracted from in situ observations. The velocity of the beams is independently evaluated from in situ observations of decaying Langmuir waves and remote radio observations. The kinetic simulations show that the level of beam-driven Langmuir waves is reduced as the two beams cross. We show that the slow beam induced a strong reduction of the quasilinear relaxation of the fast beam, limiting the amplitude of the generated Langmuir waves. Moreover, in the case of two electron beams, the lack of Langmuir wave coherence reduces the efficiency of the Langmuir parametric decay. We thus conclude that the observed depletion of the type III radio emission is independent of the radio emission mechanism, as long as it depends on the Langmuir amplitude and coherence.
机译：我们报告两个类型III的特有的交互太阳风中观察到。光束在同一磁场线交叉,一个壮观的损耗的类型三世射电观测。从海浪观测实验立体任务一起运动等离子体模拟研究类型III的灭绝无线电发射产生的交互两个电子束。观察使电子束在星际介质和显示水平的辐射无线电波后恢复光束穿越。beam-driven朗缪尔波提供证据朗缪尔衰变。从原位观察。在梁的独立评估原位观察的朗谬尔波和衰减远程无线电观测。模拟显示,beam-driven水平朗缪尔波减少两束交叉。我们表明,缓慢的光束诱导强烈减少的拟线性松弛快速的梁,限制的振幅朗缪尔波生成的。两个电子束,缺乏朗缪尔波相干性降低了朗缪尔的效率参数衰变。观察三世射电辐射损耗的类型是独立的射电辐射机制,只要它取决于朗缪尔振幅和连贯性。

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