A comparison between Monte Carlo simulations of runaway breakdown and terrestrial gamma-ray flash observations
A comparison between Monte Carlo simulations of runaway breakdown and terrestrial gamma-ray flash observations
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DOI：
10.1029/2005gl023848
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发表时间：
2005-11-19
影响因子：
5.2
通讯作者：
Smith, DM
中科院分区：
文献类型：
--
作者：
Dwyer, JR;Smith, DM
蒙特卡罗模拟的失控击穿空气被用来计算地球伽玛射线闪光（TGFs）的光谱，然后与RHESSI和CGRO/ BATSE观测结果进行比较。发现最近的RHESSI频谱与24 km以上的源高度不一致，但可以很好地拟合15 - 21 km范围内的源，这取决于源的电场几何形状。因为15公里对于雷暴的顶部来说并不罕见，特别是在低纬度地区，并且低于典型的最小雪峰高度，RHESSI数据暗示雷暴而不是雪峰可能是这些tgf的来源。另一方面，一些BATSE TGFs的软能谱与如此大的大气深度不一致，表明可能存在两种不同的TGFs来源，高度在21 km以下和30 km以上。
Monte Carlo simulations of the runaway breakdown of air are used to calculate the spectra of terrestrial gamma-ray flashes (TGFs), which are then compared with RHESSI and CGRO/ BATSE observations. It is found that the recent RHESSI spectrum is not consistent with a source altitude above 24 km but can be well fit by a source in the range of 15 - 21 km, depending upon the electric field geometry of the source. Because 15 km is not unusual for the tops of thunderstorms, especially at low latitudes, and is lower than typical minimum sprite altitudes, the RHESSI data imply that thunderstorms and not sprites may be the source of these TGFs. On the other hand, the soft energy spectrum seen in some BATSE TGFs is inconsistent with such large atmospheric depths, indicating that there may exist two distinct sources of TGFs, with altitudes below 21 km and above 30 km.