Radio signals from electron beams in terrestrial gamma ray flashes
Radio signals from electron beams in terrestrial gamma ray flashes
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来自地面伽马射线闪光中电子束的无线电信号
DOI：
10.1029/2012ja018288
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
C. Wilson
中科院分区：
文献类型：
--
作者：
V. Connaughton;M. Briggs;S. Xiong;J. Dwyer;M. Hutchins;J. Grove;A. Chekhtman;D. Tierney;G. Fitzpatrick;S. Foley;S. McBreen;P. N. Bhat;V. Chaplin;E. Cramer;G. Fishman;R. Holzworth;M. Gibby;A. Kienlin;C. Meegan;W. Paciesas;R. Preece;C. Wilson
我们表明，费米伽马射线暴监测器观测到的地面伽马射线闪光 (TGF) 与全球闪电定位网络 (WWLLN) 检测到的 VLF 放电之间的关联率在很大程度上取决于 TGF 的持续时间，最短的 TGF 在超过 50% 的时间内与 WWLLN 事件相关，而最长的 TGF 则显示出小于 10% 的匹配率。如果排除与 TGF 不同时（200 µs 内）的 WWLLN 放电，这种相关性会更强。我们推断，同时的甚低频放电来自于相对论性电子雪崩，而相对论性电子雪崩是造成伽马射线闪光的原因，而非同时的甚低频放电则来自相关的云内雷击。 WWLLN 测量的同时和非同时放电的远场辐射 VLF 中风能量的分布支持与 TGF 相关的两个离散 VLF 信号群的假设，其中同时放电是 WWLLN 测量的最强信号之一。
We show that the rate of association between terrestrial gamma ray flashes (TGFs) observed by the Fermi gamma ray burst monitor and VLF discharges detected by the World Wide Lightning Location Network (WWLLN) depends strongly on the duration of the TGF, with the shortest TGFs having associated WWLLN events over 50% of the time, and the longest TGFs showing a less than 10% match rate. This correlation is stronger if one excludes the WWLLN discharges that are not simultaneous (within 200 µs) with the TGF. We infer that the simultaneous VLF discharges are from the relativistic electron avalanches that are responsible for the flash of gamma rays and the nonsimultaneous VLF discharges are from related intracloud lightning strokes. The distributions of far‐field radiated VLF stroke energy measured by WWLLN for the simultaneous and nonsimultaneous discharges support the hypothesis of two discrete populations of VLF signals associated with TGFs, with the simultaneous discharges among the strongest measured by WWLLN.