Constraints on terrestrial gamma ray flash production from satellite observation
Constraints on terrestrial gamma ray flash production from satellite observation
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DOI：
10.1029/2006gl029229
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发表时间：
2007-04
影响因子：
5.2
通讯作者：
B. E. Carlson;N. Lehtinen;U. Inan
中科院分区：
文献类型：
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作者：
B. E. Carlson;N. Lehtinen;U. Inan
地球伽马射线闪光（TGF）的产生已经被几种发射机制所模拟。尽管对这些机制和现有卫星数据进行了广泛的研究，但关于辐射源的性质仍存在很大的不确定性。在本文中，我们提出了一种方法来开发近似的生产机制独立的约束TGF生产的基础上，通过大气中的伽马射线传播的蒙特卡罗模拟。一个广泛的范围内可能的源参数进行了模拟，根据不同的一般属性的简化源的假设。模拟的结果进行了比较，平均卫星数据，从中得到的约束。基于光子注量和光谱形状的约束条件被提出，并表明在15-20公里高度处的源为103 - 105 J。还讨论了基于TGF产生位置与航天器最低点之间的横向距离的可能限制。
Terrestrial gamma‐ray flash (TGF) production has been modeled by several emission mechanisms. In spite of extensive studies of these mechanisms and the existing satellite data, significant uncertainties exist about the nature of the source. In this paper, we present a method to develop approximate production‐mechanism‐independent constraints on TGF production on the basis of Monte Carlo simulation of gamma‐ray propagation through the atmosphere. A broad range of possible source parameters are simulated, based on assumptions of a simplified source with varying general properties. The results of the simulations are compared with averaged satellite data, from which constraints are derived. Constraints on the basis of photon fluence and spectral shape are presented and indicate a source of 103−105 J at an altitude of 15–20 km. Possible constraints based on the lateral distance between the location of TGF production and the spacecraft nadir point is also discussed.