STUDY OF LIGHTNING CURRENT AND ITS PROPAGATING PROPERTY UNDERGROUND BY REMANET MAGNETIZATION

本文对自然雷击区、火箭触发雷区、雷击遗址区和IG实验区的剩磁磁化进行了研究。在所有的情况下，样品的磁场方向显示出顺时针模式（正闪电）和/或反时针旋转模式（负闪电）周围的雷击点。此外，还观察到了剩磁强度与距闪电点的距离之间的平方反比关系。因此，即使在几十年前的考古遗址中也发现了雷致剩磁的性质，我们认为雷致剩磁（LRM）在研究闪电现象中是有用的。作为雷电流化石的雷电参考模型，可以揭示地下雷电流路径的重要特征，为接地系统的设置提供有价值的信息。雷电已从气象学、高压工程学、大气电学等多个角度进行了研究，这些都是从地面上的上部区域采用的。本文认为，磁化作为雷电流的化石，将是未来雷电科学发展的新方法。

A study of remanent magnetization is made at the areas of natural lightning strikes, at the rocket-triggered lightning, at the lighting attacked archaeological site, at the IG experiment. In all the cases, the magnetic direction of the specimens shows a clockwise pattern(positive lightning)and/or a anticlockwise rotation pattern(negative lightning)around the point of lightning strike. Also, the squared inverse relation is clearly observed between the intensity of remanent magnetization and the distance from the lightning point. As such the property of lightning induced remanent magnetization is identified even in the archaeological site in few tens kyrs before, we conclude that the lightning caused remanent magnetization(LRM)is useful in the study of lighting phenomena. The LRM as the fossil of lighting current can elucidate the important feature of the path of lighting current underground, which becomes the valuable information for the setting of earth(grounding).Lightning has been investigated from various standpoints, such as meteorology, high-voltage engineering, atmospheric electricity etc., that are all adopted on the upper area from the ground. We, in this study conclude the magnetization as a fossil of lightning currents will be new method in the future progress of lightning science.