First RHESSI terrestrial gamma ray flash catalog
First RHESSI terrestrial gamma ray flash catalog
复制标题
DOI：
10.1029/2008ja013721
复制
发表时间：
2009-02
影响因子：
--
通讯作者：
B. Grefenstette;David M. Smith;B. Hazelton;L. Lopez
中科院分区：
文献类型：
--
作者：
B. Grefenstette;David M. Smith;B. Hazelton;L. Lopez
我们总结了鲁文·拉马蒂高能太阳光谱成像仪（RHESSI）地面伽马射线闪光（TGF）目录的数据。我们描述了RHESSI搜索算法，并讨论了它的局限性，因为它的设计强调整洁而不是完整性。该搜索算法在2002年3月至2008年2月之间识别了820个tgf。辐射对RHESSI探测器的损害导致2006年初之后灵敏度下降，2006 - 2008年确定的tgf数量相应减少。在此之前，平均每2.35天出现1个TGF。RHESSI已经发现了多个TGFs与单一风暴系统相关，要么在同一轨道上，要么在随后的轨道上。所有TGF周围100ms基座区域的x射线通量为TGF平均峰值通量的（1.3±1.9）× 10−3倍。我们表明，在许多TGF的峰值50 μs期间，RHESSI计数达到或接近其最大吞吐量，并且我们还不知道TGF的最大可能亮度。在短时间尺度上，一些tgf可能比RHESSI或BATSE观测到的要亮得多。最后，我们表明，当它们按亮度、地理纬度、地磁纬度或当地白天和黑夜分组时，tgf的光谱没有可检测到的变化。
[1] We present a summary of data from the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) terrestrial gamma ray flash (TGF) catalog. We describe the RHESSI search algorithm and discuss its limitations due to its design emphasis on cleanliness rather than completeness. This search algorithm has identified 820 TGFs between March of 2002 and February of 2008. Radiation damage to the RHESSI detectors has resulted in a decreased sensitivity after early 2006 and a corresponding decrease in the number of identified TGFs in the years 2006–2008. Prior to this, the average rate of occurrence was one TGF every 2.35 days. RHESSI has seen multiple TGFs associated with a single storm system, either in the same orbit or in the subsequent orbit. The X-ray flux in a 100 ms pedestal region surrounding all of the TGFs is (1.3 ± 1.9) × 10−3 times the average peak flux of a TGF. We show that RHESSI was counting at or near its maximum throughput during the peak 50 μs of many of the TGFs and that we do not yet know the maximum possible brightness of a TGF. On short time scales, some TGFs may be much brighter than could be observed by either RHESSI or BATSE. Finally, we show that there is no detectable change in the spectrum of TGFs when they are grouped by brightness, geographic latitude, geomagnetic latitude, or the local day or night.