Temporal properties of the terrestrial gamma‐ray flashes from the Gamma‐Ray Burst Monitor on the Fermi Observatory
Temporal properties of the terrestrial gamma‐ray flashes from the Gamma‐Ray Burst Monitor on the Fermi Observatory
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DOI：
10.1029/2010ja016084
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发表时间：
2011-07
影响因子：
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通讯作者：
G. Fishman;M. Briggs;V. Connaughton;P. N. Bhat;W. Paciesas;A. Kienlin;C. Wilson-Hodge;R. Kippen;R. Preece;C. Meegan;J. Greiner
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文献类型：
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作者：
G. Fishman;M. Briggs;V. Connaughton;P. N. Bhat;W. Paciesas;A. Kienlin;C. Wilson-Hodge;R. Kippen;R. Preece;C. Meegan;J. Greiner
[1]费米伽马射线太空望远镜（Fermi）上的伽马射线暴监测器（GBM）在其运行的前20个月内检测到50次地面伽马射线闪光（TGFs）。GBM探测器的高效率和大面积，结合其精细的定时能力和相对高的吞吐量，允许前所未有的研究TGFs的时间特性。观察到的TGF脉冲的持续时间短至0.05毫秒，比以前测得的短。脉冲持续时间的分布相对较窄;大多数脉冲的总持续时间在0.10和0.40 ms之间。在一些TGF事件中，观察到的上升时间短至0.01 ms，下降时间短至0.03 ms。这里呈现的50个TGF中的三个具有良好分离的双峰。也许多达10个其他TGF在不同程度上显示出重叠峰的证据。在某些事件的前沿或后沿可以看到微弱的发射。50个TGFs中有5个比通常的长得多;这些被认为是由从地磁共轭点处的TGFs传输的入射电子引起的。TGF的时间特性可以用来区分TGF的起源模型，也提供了一些基本的物理性质的TGF过程。
[1] The Gamma-Ray Burst Monitor (GBM) on the Fermi Gamma-Ray Space Telescope (Fermi) detected 50 terrestrial gamma-ray flashes (TGFs) during its first 20 months of operation. The high efficiency and large area of the GBM detectors, combined with their fine timing capabilities and relatively high throughput, allow unprecedented studies of the temporal properties of TGFs. The TGF pulses are observed to have durations as brief as ∼0.05 ms, shorter than previously measured. There is a relatively narrow distribution of pulse durations; the majority of pulses have total durations between 0.10 and 0.40 ms. In some TGF events, risetimes as short as ∼0.01 ms and falltimes as short as ∼0.03 ms are observed. Three of the 50 TGFs presented here have well-separated, double peaks. Perhaps as many as 10 other TGFs show evidence, to varying degrees, of overlapping peaks. Weak emission is seen at the leading or trailing edges of some events. Five of the 50 TGFs are considerably longer than usual; these are believed to be caused by incident electrons transported from a TGF at the geomagnetic conjugate point. TGF temporal properties can be used to discriminate between models of the origin of TGFs and also provide some basic physical properties of the TGF process.