Artificially triggered lightning and its characteristic discharge parameters in two severe thunderstorms |
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作者单位: | QIE XiuShu(Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000,China;Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China) ;
ZHANG QiLin(Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000,China) ;
ZHOU YunJun(Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000,China) ;
FENG GuiLi(Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000,China) ;
ZHANG TingLong(Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000,China) ;
YANG Jing(Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000,China) ;
KONG XiangZhen(Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000,China) ;
XIAO QingFu(Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000,China) ;
WU ShuJun(Binzhou Meteorology Bureau, Binzhou 256612, China) ; |
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基金项目: | 国家自然科学基金;清华大学校科研和教改项目 |
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摘 要: | The lightning-induced-damages in the mid-latitude regions are usually caused during severe thunder-storms. But the discharge parameters of natural lightning are difficult to be measured. Five lightning flashes have been artificially triggered with the rocket-wire technique during the passage of two severe thunderstorms. The discharge current and close electric field of return stroke in artificially triggered lightning have been obtained in microsecond time resolution by using current measuring systems and electric field change sensors. The results show that the five triggered lightning flashes include 1 to 10 return strokes, and the average return stroke current is 11.9 kA with a maximum of 21.0 kA and a mini-mum of 6.6 kA, similar to the subsequent return strokes in natural lightning. The half peak width of the current waveform is 39 μs, which is much larger than the usual result. The peak current of stroke Ip (kA) and the neutralized charge Q(C) has a relationship of Ip = 18.5Q0.65. The radiation field of return stroke is 5.9 kV·m-1 and 0.39 kV·m-1 at 60 m and 550 m, respectively. The radiation field decreases as r -1.119 with increase of horizontal distance r from the discharge channel. Based on the well-accepted transmission line model, the speed of return stroke is estimated to be about 1.4×108 m·s-1, with a variation range of (1.1―1.6)×108 m·s-1. Because of the similarities of the triggered lightning and natural lightning, the results in this article can be used in the protection design of natural lightning.
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收稿时间: | 3 April 2006 |
修稿时间: | 19 September 2006 |
Artificially triggered lightning and its characteristic discharge parameters in two severe thunderstorms |
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Authors: | Qie XiuShu Zhang QiLin Zhou YunJun Feng GuiLi Zhang TingLong Yang Jing Kong XiangZhen Xiao QingFu Wu ShuJun |
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Institution: | 1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000,China;Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China 2. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000,China 3. Binzhou Meteorology Bureau, Binzhou 256612, China |
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Abstract: | The lightning-induced-damages in the mid-latitude regions are usually caused during severe thunderstorms. But the discharge
parameters of natural lightning are difficult to be measured. Five lightning flashes have been artificially triggered with
the rocket-wire technique during the passage of two severe thunderstorms. The discharge current and close electric field of
return stroke in artificially triggered lightning have been obtained in microsecond time resolution by using current measuring
systems and electric field change sensors. The results show that the five triggered lightning flashes include 1 to 10 return
strokes, and the average return stroke current is 11.9 kA with a maximum of 21.0 kA and a minimum of 6.6 kA, similar to the
subsequent return strokes in natural lightning. The half peak width of the current waveform is 39 μs, which is much larger
than the usual result. The peak current of stroke I
p (kA) and the neutralized charge Q(C) has a relationship of I
p = 18.5Q
0.65. The radiation field of return stroke is 5.9 kV·m−1 and 0.39 kV·m−1 at 60 m and 550 m, respectively. The radiation field decreases as r
−1.119 with increase of horizontal distance r from the discharge channel. Based on the well-accepted transmission line model, the speed of return stroke is estimated to
be about 1.4×108 m·s−1, with a variation range of (1.1–1.6)×108 m·s−1. Because of the similarities of the triggered lightning and natural lightning, the results in this article can be used in
the protection design of natural lightning.
Supported by the National Natural Science Foundation of China (Grant Nos. 40135010 and 40325013) and the Ministry of Science
and Technology of China (Grant No. 2004DEA71070) |
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Keywords: | artificially triggered lightning characteristic discharge parameters current waveform electric field change in close distance severe thunderstorm |
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