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The Systematic Observation of the Thundercloud and Lightning

雷云闪电的系统观测

基本信息

批准号：
03041052
负责人：
MATSUURA Kenji
金额：
$ 6.08万
依托单位：
Osaka University Faculty of Engineering
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

The systematic thunderstorm observation was caraaid out at Orlando, Florida during the thunderstrom season in 1993. Concerning the Japanese scientist groups, Osaka University is assigned to the electric field change observation at the two different points simultaneously using the newly developed wideband slow antenna. Gifu University is assigned to the observation of a lightning channel by a video camera and by an optical measurement system which maintains the high spatial resolution and we can obtain an idea on the lightning channel variation in the direction of the diameter. Gifu University also equipped an optical measurement system with which they can discriminate the time difference of so called simultaneous multi point lightning strikes. On the other hand concerning the group of U.S., National Severe Storm Laboratory (NSSL) is assigned to taking high speed video pictures of lightning channels by a hand made whole sky camera. New Mexico Tech is assigned to the operation of the VHF imaging system of lightning channel in side the thundercloud.Since the lightning discharge is a transient phenomena which is sometimes shorter than 1 sec., the most laborious work for the multi point observation is the operation of the common and accurate time standard. Normally we use the transient memory to record the observed signals and To produce the common trigger signal is often difficult, We equipped the two slow antenna 2.5 km away each other and we decided that for the trigger signal of the systems The luminous signal emitted from lightnings discharges is used. We are convinced the excellent synchronization of recorded data at two different point without the real time connection.We had eight thunderstorm days in early August and captured many preferable data. Those are surely effective to understand the mechanism of simultaneous multi point lightning strikes. The analysis is undertaken at each Institute.

1993年雷暴季节在佛罗里达奥兰多进行了系统的雷暴观测。关于日本科学家团体，大坂大学被分配使用新开发的宽带慢天线同时进行两个不同点的电场变化观测。岐阜大学被分配到一个视频摄像机和光学测量系统，保持高空间分辨率的闪电通道的观测，我们可以得到一个想法的闪电通道的直径方向的变化。岐阜大学还配备了一个光学测量系统，他们可以区分所谓的同时多点雷击的时间差。另一方面，关于美国集团，美国国家强风暴实验室（NSSL）被指派用一台手工制作的全天空照相机拍摄闪电通道的高速视频图像。新墨西哥州技术人员被分配到雷暴云中闪电通道VHF成像系统的操作中。由于闪电放电是一种瞬态现象，有时短于1秒，多点观测中最费力的工作是使用通用而精确的时间标准。通常情况下，我们使用瞬态存储器来记录观察到的信号，并产生共同的触发信号往往是困难的，我们配备了两个慢天线2.5公里以外的对方，我们决定，为系统的触发信号，从闪电放电发出的发光信号被使用。我们确信在没有真实的时间连接的情况下，两个不同点的记录数据具有很好的同步性。这对认识多点同时雷击的机理是有效的。分析工作在每个研究所进行。