Electric fields and electron energies inferred from the ISUAL recorded sprites
Electric fields and electron energies inferred from the ISUAL recorded sprites
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DOI：
10.1029/2005gl023389
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发表时间：
2005-10-05
影响因子：
5.2
通讯作者：
Takahashi, Y
中科院分区：
文献类型：
--
作者：
Kuo, CL;Hsu, RR;Takahashi, Y
电子能量和电场强度的精灵推导出五个选定的事件，这是记录的空间仪器称为ISUAL（精灵和高层大气闪电成像仪; FORMOSAT-2卫星上的有效载荷）。从这些精灵的分光光度计通道2（以337 nm为中心）和通道3（以391.4 nm为中心）的导出的峰强度比，发现平均和特征电子能量分别在6.2 - 9.2 eV和4.5 - 6.5 eV的范围内。在40 - 60公里处的E/N估计值为243 - 443 Td，电场强度是大气击穿电场强度的2.1 - 3.7倍。推断的电子能量和电场强度比从地面活动推断的高出约两倍。然而，它们与精灵流光模型的预测是一致的。
Electron energies and the strength of electric fields in sprites are deduced for five selected events, which were recorded by the space-borne instrument called ISUAL (Imager of Sprites and Upper Atmospheric Lightning; a payload on the FORMOSAT-2 satellite). From the derived peak intensity ratios of spectrophotometer channel 2 (centered at 337 nm) and channel 3 ( centered at 391.4 nm) of these sprites, the average and characteristic electron energies were found to be in the range of 6.2 - 9.2 eV and 4.5 - 6.5 eV, respectively. The estimated E/N at 40 - 60 km is 243 - 443 Td and the strength of the electric field is 2.1 - 3.7 times that of the atmosphere breakdown E-field at these altitudes. The inferred electron energies and the strength of electric fields are about two times higher than those inferred from ground campaigns. However, they are consistent with the prediction of the sprite streamer model.