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

重磁化研究雷电流及其地下传播特性

• 批准号: 10555090
• 负责人: SAKAI Hideo
• 金额: $ 3.84万
• 依托单位: TOYAMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10555090/
• 关键词: lightning caused remanent magnetization; rocket-triggered lightning; the lighting attacked archaeological site; clockwise and anticlockwise rotation pattern; positive polarity and negative polarity of lightning; path of lighting current underground /

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.

在自然闪电地区、火箭触发闪电、雷击考古遗址、IG实验中，对剩余磁化进行了研究。在所有情况下，样品的磁场方向都表现为围绕闪电击点的顺时针方向(正闪电)和/或逆时针旋转模式(负闪电)。此外，在剩余磁化强度与闪电距离之间也有明显的平方反比关系。因此，即使在几十年前的考古遗址中也发现了闪电引起的剩余磁化的性质，我们认为闪电引起的剩余磁化(LRM)在闪电现象的研究中是有用的。LRM作为雷电的化石，可以阐明地下雷电电流路径的重要特征，为地面(地)的设置提供了有价值的信息。人们从气象学、高压工程、大气电学等多个角度对雷电进行了研究，这些雷电都是从地面上采集的。在本研究中，我们得出结论，磁化作为雷电电流的化石将是未来闪电科学发展的新方法。

项目成果

Fujinawa, Y.et al.: "Electromagnetic field anomaly associated with the swarms"Phys.Chem.Earth. 25. 247-253 (2000)

Fujinawa, Y.et al.：“与群体相关的电磁场异常”Phys.Chem.Earth。

Minowa, M.et al.: "Ground potential rise around a test transmission tower for lightning current triggered by rocket"Int.Conf.on Ground and Earthing, 1169-172, Belo Horizonte-Brazil. (2000)

Minowa, M.等人：“火箭触发的雷电电流测试传输塔周围的接地电位升高”Int.Conf.on Ground and Earthing，1169-172，巴西贝洛奥里藏特。

Sakai, H.et al.: "Study of Lightning Corrent by remanent magnetization"Electrical Engineering in Japan, 123, No.4, 41-47, Scripta Technica. (1998)

Sakai, H.et al.：“通过剩磁研究雷电流”日本电气工程，123，第 4 期，41-47，Scripta Technica。

Fujinawa, Y.et al.: "Electromagnetic field anomaly associated with the swarms in central Japan"Phys.Chem.Earth. 25. 247-253 (2000)

Fujinawa, Y.et al.：“与日本中部虫群相关的电磁场异常”Phys.Chem.Earth。

Hirooka, K.: "Geomagnetic secular variation inferred from archeomagnetic studies in Japan and its application to earth sciences, in 'Restration of history of volcanic activity', Disaster Prevension Research Institute"Kyoto Univ.. 1-10 (1998)

Hirooka, K.：“根据日本古地磁研究推断的地磁长期变化及其在地球科学中的应用，载于“火山活动历史的恢复”，防灾研究所”京都大学 1-10 (1998)