Lightning Observation in Inland Plateau Area of China

中国内陆高原地区闪电观测

基本信息

批准号：
09041124
负责人：
WATANABE Teiji
金额：
$ 3.58万
依托单位：
Gifu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1997
资助国家：
日本
起止时间：
1997 至无数据
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09041124/
关键词：
lightning triggered lightning positive discharge interferometer bi-directional leader

项目摘要

A few data on natural and artificially triggered lightning have been obtained during a comprehensive field experiment carried out in the summer of 1997, in inland plateau area of China. Following are some of the preliminary results of data analysis.For natural discharges, analyzes on the data of both discharge sources by wide-band interferometer and electric field change by capacitive antennas indicate that a intra-cloud discharge usually begins with a negative leader initiating from the lower negative charge center and then propagating towards the upper part of the cloud. The comparison of discharge noise sources with radar echoes also show that the noise sources mainly concentrated within a up and a low two layrs in the cloud.For artificially triggering lightning, we have succeeded firstly on altitude triggered positive discharge lightning with a bi-directional leader process in inland plateau area of China. According to the simultaneous observation results of base current, electric field change and optical image, following model of bi-directional leader development for this triggered positive discharge has been figured out. After the rocket reaches a height of a few hundred meters, a downward positive leader firstly initiated from the lower end of the wire attached to the rocket. A few microseconds later, a negative leader intiated at the up end of the same wire and propagating upward. When the downward positive leader going down and connecting with a wire grounded, a pulsating discharge occurred. In addition, a classical positive triggered lightning was also succeeded and the current associating with the upward negative leader in this discharge was observed directly.

在1997年夏天在中国内陆高原地区进行的全面实验实验中，已经获得了一些关于自然和人为触发的闪电的数据。以下是数据分析的一些初步结果。对于自然放电，通过宽波段干涉仪对两种排放源的数据进行分析，电容天线通过电容性天线进行变化表明，云内放电通常始于负面的领导者。下部负电荷中心，然后向云的上部传播。放电噪声源与雷达回声的比较还表明，噪声源主要集中在云中的向上和低两个线条。对于人为触发闪电，我们首先在高度上触发了带有双向领导者的正触发闪电。中国内陆高原地区的过程。根据基本电流，电场变化和光学图像的同时观察结果，根据该触发的阳性排放的双向领导者发展模型。在火箭达到几百米的高度之后，首先是从连接到火箭的电线的下端发起的向下正向领导者。几微秒之后，一个负领导者在同一条电线的上端进行了直觉，并向上传播。当向下的正向领导者向下降低并与接地的电线连接时，发生了脉动放电。此外，还取得了经典的正触发闪电，并且直接观察到与该放电的向上负引导者的当前相关联。