Lightning leader altitude progression in terrestrial gamma‐ray flashes
Lightning leader altitude progression in terrestrial gamma‐ray flashes
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DOI：
10.1002/2015gl065228
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发表时间：
2015-09
影响因子：
5.2
通讯作者：
S. Cummer;F. Lyu;M. Briggs;G. Fitzpatrick;O. Roberts;J. Dwyer
中科院分区：
文献类型：
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作者：
S. Cummer;F. Lyu;M. Briggs;G. Fitzpatrick;O. Roberts;J. Dwyer
无线电发射继续提供洞察力的生产地面伽玛射线闪光（TGFs）的雷暴，包括关键问题的条件下，他们产生的。我们已经确定了几个TGF相关的闪电无线电发射，其中可以测量TGF之前和之后的云中闪电先导脉冲的高度。我们结合联合收割机这些与高绝对定时精度TGF观测费米卫星，以确定闪电通道的发展之前，期间和之后的TGF生产。所有这些TGF都是在先导启动后几毫秒内产生的，并且当先导达到1-2公里长时。在TGFs之后，领导者都继续上升了几公里，他们的特征没有显着变化，尽管他们都表现出0.8-1.0 × 106米/秒的高平均速度。TGF模型的背景下的影响进行了讨论。这些结果描绘了发生在TGF生产之前，期间和之后的闪电过程的第一个清晰的画面。
Radio emissions continue to provide insight into the production of terrestrial gamma ray flashes (TGFs) by thunderstorms, including the critical question of the conditions under which they are generated. We have identified several TGF‐associated lightning radio emissions in which the altitudes of in‐cloud lightning leader pulses that precede and follow the TGF can be measured. We combine these with high absolute timing accuracy TGF observations from the Fermi satellite to determine the development of the lightning channel before, during, and after the TGF production. All of these TGFs were produced several milliseconds after the leader had initiated and when the leaders reached 1–2 km in length. After the TGFs, the leaders all continued to ascend for several more kilometers with no dramatic change in their characteristics, although they all exhibited high average velocities of 0.8–1.0 × 106 m/s. Implications in the context of TGF models are discussed. These results paint the first clear picture of the lightning processes that occur before, during, and after TGF production.