Lightning charge moment changes for the initiation of sprites
Lightning charge moment changes for the initiation of sprites
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DOI：
10.1029/2001gl014593
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发表时间：
2002-04
影响因子：
5.2
通讯作者：
Wenyi Hu;S. Cummer;W. Lyons;T. Nelson
中科院分区：
文献类型：
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作者：
Wenyi Hu;S. Cummer;W. Lyons;T. Nelson
2000年夏季，在杜克大学连续测量了北美闪电放电辐射的瞬态极低频（~ 50 - 5000hz）磁场。总共分析了17天内881例精灵相关的闪电放电。我们详细报告了76个精灵，我们可以可靠地确定精灵开始时的ELF数据的闪电电荷矩变化。通过将产生闪电和所有正极闪电的电荷矩分布折叠在一起，我们发现，产生1000 C km电荷矩的闪电产生精灵的概率为90%，而小于600 C km电荷矩变化小于6 ms的闪电产生精灵的概率为<10%。
The transient ELF(∼50–5000 Hz) magnetic field radiated by lightning discharges across North America was continuously measured at Duke University during the summer of 2000. In total, 881 sprite‐associated lightning discharges over 17 days were analyzed. We report in detail on 76 sprites for which we could reliably determine the lightning charge moment change from the ELF data at the time of sprite onset. The charge moment change for the initiation of a sprite is found to be as low as 120 C km. By folding together the charge moment distributions of sprite‐producing lightning and all positive lightning, we find that the probability of sprite generation for lightning with >1000 C km charge moment change in 90%, while the sprite probability for lightning with <600 C km charge moment change in <6 ms is <10%.