Measurements and implications of the relationship between lightning and terrestrial gamma ray flashes
Measurements and implications of the relationship between lightning and terrestrial gamma ray flashes
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DOI：
10.1029/2005gl022778
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发表时间：
2005-04
影响因子：
5.2
通讯作者：
S. Cummer;Y. Zhai;Wenyi Hu;David M. Smith;L. Lopez;M. Stanley
中科院分区：
文献类型：
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作者：
S. Cummer;Y. Zhai;Wenyi Hu;David M. Smith;L. Lopez;M. Stanley
我们报告的观测和分析30 kHz的无线电发射（sferics）从闪电放电与26个地面伽马射线闪光（TGFs）记录的RHESSI卫星在加勒比海和美洲，1500和4000公里之间的磁场传感器位于杜克大学。其中13个TGFs出现在从RHESSI子卫星点方向的正极性闪电放电的−3/+1 ms内，强烈表明TGFs与这些放电有关。事件的时间和天球方向发现表明，放电发生在一个半径为300公里的RHESSI卫星点周围的圆。虽然正极性的所有13个放电是一致的失控击穿，闪电电荷矩的变化约两个数量级小于目前的高空失控击穿理论预测。这些测量的影响进行了讨论。
We report observations and analysis of 30 kHz radio emissions (sferics) from lightning discharges associated with 26 terrestrial gamma ray flashes (TGFs) recorded by the RHESSI satellite over the Caribbean and Americas, between 1500 and 4000 km away from the magnetic field sensors located at Duke University. Thirteen of the TGFs are found to occur within −3/+1 ms of lightning discharges of positive polarity from the direction of the RHESSI subsatellite point, strongly indicating that the TGFs are linked to these discharges. The event timing and sferic direction finding reveals that the discharges occur within a ∼300 km radius circle around the RHESSI subsatellite point. Although the positive polarity of all 13 discharges is consistent with runaway breakdown, the lightning charge moment changes are approximately two orders of magnitude smaller than present high altitude runaway breakdown theory predicts. Implications of these measurements are discussed.