Analysis of radiation evolution characteristics of the artificial triggered lightning channel
doi: 10.3788/CO.20191203.0670
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摘要: 利用无狭缝光谱仪获得了一次人工触发闪电过程的发射光谱，其时间分辨率为20 μs，同时获得了通道底部电流强度，对不同电流强度下闪电光谱的辐射特性进行了分析。根据谱线持续时间将谱线分为三类，结合谱线激发能以及通道电流变化对影响谱线持续时间的原因展开了研究。对光谱总强度随时间的变化规律进行了分析，对闪电光谱短波段与长波段连续背景辐射的不同机制进行了分析，给出了两种辐射机制对连续背景辐射衰减的影响。Abstract: The spectrum of one triggered lightning with time resolution of 20 μs was observed by using the slit-less spectrograph and the current intensity at the channel bottom was obtained, based on which the radiation characteristics of the lightning spectrum under different current intensities were analyzed. The duration of the spectral line was analyzed according to the excitation energy of the spectral line and the change of the channel current. As a result, the spectral lines were divided into three types. Furthermore, mechanisms of the continuous background radiation of short wavelength and long wavelength were analyzed, respectively. The influences of two radiation mechanisms on continuous background radiation attenuation were researched.
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Key words:
- triggered lightning /
- channel plasma /
- lightning spectrum /
- channel current
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Figure 2. Original spectra of two return strokes variation with time in discharge channel
Table 1. Current parameters of R9, R10
Peak current/kA 10%-90% rise time/μs Half peak time/μs The full wave time/μs Transfer charge/Q R9 11.64 0.28 3.2 0.57 0.60 R10 10.34 0.2 3.08 0.60 0.45 
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