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高原气象  2011 

双极性窄脉冲电场波形特征

, PP. 823-830

Keywords: 双极性窄脉冲,电场波形,孤立性

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Abstract:

利用2007年夏季野外试验取得的多站电场数据,通过一个较为宽泛的标准并配以手动判别的方法,挑选出14871例双极性窄脉冲(NBE)的电场波形,对比分析了正、负极性NBE的3个基本特点:极窄的宽度、极大的峰值及孤立性。结果表明,两者的电场波形特征具有明显的差异。正、负极性NBE的脉冲平均宽度分别为6.42μs和5.46μs,并且正极性NBE的脉冲宽度更容易出现极大值,其最大值为19.76μs。正、负极性NBE的脉冲平均峰值分别为403.4和627.0数字单位,而同时期观测到的97713例负地闪回击的平均电场峰值仅为256.7数字单位。负极性NBE的脉冲峰值更容易出现极大值,其最大值为5118数字单位,而正极性NBE的脉冲峰值最大值为3347数字单位。NBE的孤立性明显,分别有73.5%和78.5%的NBE在其发生后和发生前的1s内没有其他任何触发事件。正、负极性NBE的孤立性差异也较明显,4.39%的正极性NBE在其发生后的10ms内出现了其他放电过程,而负极性NBE对应的比例仅为1.61%。基于这些特点,并结合两者放电高度的差异,初步探讨了两者放电过程的一些差异。

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