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Cloud-to-Ionosphere Discharge, Electromagnetic Radiation and Their Effect on Power Transmission.

云到电离层放电、电磁辐射及其对电力传输的影响。

基本信息

批准号：
09450110
负责人：
HAYAKAWA Masashi
金额：
$ 8.96万
依托单位：
The University of Electro-Communications
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

It is well known that winter lightning in the Japan sea area has a significant characteristic of positive cloud-to-ground discharge (+CG), and that it has an extremely serious influence on the power transmission in the area of Hokuriku. Such +CG is recently found to trigger a strong electric field in the atmosphere, inducing red sprites (or so) and leading to the perturbation in the lower ionosphere. This work will focus on the complete understanding of this upper atmosphere discharges and the associated phenomena, and also on the effect of such discharges on the power transmission.During the winter of 1997/1998, we tried the first experiment for the Hokuriku winter lightning and the associated phenomena ; (1) optical measurement from Mt. Zao in Tahara town near Toyohashi, (2) observation of ELF transients from the upper atmosphere discharges at Moshiri in Hokkaido, and (3) VLF scattering from the lower ionospheric perturbations (by means of the NWC subionospheric signal propagation). … More In the first winter the optical measurement was not so good due to the insufficient preparation, but we can list the important features for other phenomena. When we compare the associated phenomena (ELF sferics and VLF scattering) for +GG and -CG, it is found that +CG could trigger ELF transients and ionospheric perturbation more often (by about twice) than for -CG.However, this difference is not so big when we assume the presence of plasma column below the lower ionosphere, which means that this kind of hypothesis of such a plasma column is questionable.During the next winter of 1998/1999, we made the successful measurement again, and we are now analyzing the data extensively. We do hope that we could obtain significant results, especially with great emphasis on the optical measurement.Finally, the coupling of such discharges on the power transmission (or transmission lines) was investigated. Then, we have obtained the voltage and current induced at the end of the transmission line by means of the transmission line model. Less

众所周知，日本海域冬季闪电具有明显的正地云放电(+CG)特征，对北陆地区的输电影响极为严重。最近发现，这种+CG会在大气中触发一个强大的电场，引发红色精灵(或更多)，并导致低电离层的扰动。这项工作将集中于对这种高层大气放电及其相关现象的全面了解，以及这种放电对能量传输的影响。1997/1998年冬季，我们尝试了第一次北国冬季闪电及其相关现象的实验：(1)从Mt.(2)观测北海道莫什里高空大气放电的极低频瞬变；(3)低电离层扰动的甚低频散射(通过NWC电离层下信号传播)。…更多的是在第一个冬天，由于准备不足，光学测量不是很好，但我们可以列出其他现象的重要特征。当我们比较+GG和-CG的相关现象(ELF和VLF散射)时，我们发现+CG触发ELF瞬变和电离层扰动的频率比-CG高约两倍，但当我们假设在低电离层下方存在等离子体柱时，这种差异就不那么大，这意味着这种等离子体柱的假设是值得怀疑的。在1998/1999年的第二个冬天，我们再次成功地进行了测量，现在我们正在广泛地分析数据。我们希望能够得到有意义的结果，特别是在光学测量方面。最后，我们研究了这种放电在电力传输(或传输线)上的耦合。然后，利用传输线模型得到了传输线端部感应的电压和电流。较少