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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Observational evidence for the collapsing Langmuir wave packet in a solar type III radio burst
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Observational evidence for the collapsing Langmuir wave packet in a solar type III radio burst

机译：朗缪尔崩溃的观测证据波包在太阳III型电台破裂

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High time resolution observations from the STEREO spacecraft show that in solar type III radio bursts, Langmuir waves often occur as very intense one-dimensional magnetic field aligned field structures. One of these events represents the most intense Langmuir wave packet with W_L/ n _eT_e～7.2×10-3 ever detected in a type III radio burst until now (W_L is the peak energy density, and n_e and T_e are the electron density and temperature, respectively). The detailed analysis of this wave packet indicates that (1) its peak intensity is well above the threshold for the oscillating two-stream instability (OTSI) and supersonic collapse; (2) its peak intensity and spatial scale satisfy the criterion for it to be a collapsing envelope soliton; (3) its low-frequency components provide evidence for a density cavity, whose depth, width, and temporal coincidence indicate that probably it is the ponderomotive force generated density cavity; and (4) its spectrum contains harmonic peaks at 2f_(pe) and 3f_(pe) (in addition to the main Langmuir wave peak at the electron plasma frequency, f_(pe)), which, as indicated by the bispectral analysis, probably are of the electromagnetic waves generated as a result of coalescence of two oppositely propagating Langmuir waves, and a Langmuir wave and a second harmonic electromagnetic wave, respectively. These characteristics strongly suggest that this wave packet and its associated density cavity represent the collapsing envelope soliton-caviton pair formed as a result of OTSI, and in the present case, the strong turbulence processes probably play key roles in the beam stabilization as well as conversion of Langmuir waves into escaping radiation at 2f_(pe) and 3f_(pe).
机译：高时间分辨率从立体观测飞船显示在太阳III型电台破裂,朗缪尔波很经常发生强烈的一维磁场一致场结构。最激烈的朗谬尔波包与W_L / n_eT_e ~ 7.2×III型无线电探测到的三分直到现在破裂(W_L峰值能量密度,和n_e T_e电子密度和温度,分别)。这波包表明(1)高峰强度远高于阈值的振荡(OTSI)和二束不稳定超音速崩溃;空间尺度满足的标准一个崩溃的包络孤子;低频组件提供证据密度腔的深度、宽度、和时间巧合可能表明它是有质动力生成密度腔;(4)它的光谱包含谐波的峰值2 f (pe) f (pe)和3(除了主朗缪尔波高峰电子等离子体频率,f (pe)),如所示双谱分析,可能的电磁波产生的结果合并两个面对面的传播朗缪尔波浪,一波朗缪尔和第二个分别谐波电磁波。这些特征强烈建议波包及其相关密度腔代表了信封soliton-caviton崩溃对由于OTSI形成,目前情况下,强烈的湍流过程可能在光束稳定上发挥了关键作用朗缪尔波转化为逃离辐射2 f (pe)和f (pe) 3。

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