Measurements of x‐ray emission from rocket‐triggered lightning
Measurements of x‐ray emission from rocket‐triggered lightning
复制标题
火箭触发闪电的 X 射线发射测量
DOI：
10.1029/2003gl018770
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发表时间：
2004
影响因子：
5.2
通讯作者：
C. Smyth
中科院分区：
文献类型：
--
作者：
J. Dwyer;H. Rassoul;M. Al;L. Caraway;B. Wright;A. Chrest;M. Uman;V. Rakov;K. Rambo;D. Jordan;J. Jerauld;C. Smyth
我们报告了在2003年夏天使用四个放置在距离闪电通道15到40米之间的仪器测量火箭触发闪电的x射线发射。在观察到的26次回击中，73%在回击前和开始时进行了X线片测量，测量范围为0-80μ。这次发射是由30-250keV范围内的多次非常短暂的X射线爆发组成的，每次爆发的持续时间通常不到1μS。初步观察到的X射线在空间和时间上与省道领袖有关，可能从回击开始就有贡献，最强烈的X射线爆发来自地面50米∼范围内的闪电通道部分。由于触发的雷击与自然闪电中的后续雷击相似，因此X射线发射很可能是自然闪电的常见属性。
We report measurements of the x‐ray emission from rocket‐triggered lightning, made during the summer of 2003, using four instruments placed between 15 and 40 m from the lightning channels. X‐rays were measured 0–80 μs just prior to and at the beginning of 73% of the 26 return strokes observed. The emission was composed of multiple, very brief bursts of x‐rays in the 30–250 keV range, with each burst typically lasting less than 1 μs. The x‐rays were primarily observed to be spatially and temporally associated with the dart leaders with a possible contribution from the beginning of the return strokes, with the most intense x‐ray bursts coming from the part of the lightning channel within ∼50 m of the ground. Because triggered lightning strokes are similar to subsequent strokes in natural lightning, it is likely that x‐ray emission is a common property of natural lightning.