| 闪电放电过程的近红外光谱及温度沿放电通道的演化特征 |
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| 引用本文： | 瞿海燕,袁萍,张华明,郄秀书.闪电放电过程的近红外光谱及温度沿放电通道的演化特征[J].地球物理学报,2012,55(8):2508-2513. |
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| 作者姓名： | 瞿海燕 袁萍 张华明 郄秀书 |
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| 作者单位： | 1. 西北师范大学物理与电子工程学院,甘肃省原子分子物理与功能材料重点实验室,兰州 730070;2. 中国科学院国家科学图书馆兰州分馆,兰州 730000;3. 山西省雷电防护监测中心,太原 030002;4. 中国科学院大气物理研究所,北京 100029 |
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| 基金项目： | 西北师范大学科技创新工程项目(NWNU-KJCXGC-03-21)资助 |
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| 摘 要： | 利用无狭缝红外光谱仪, 获得山东地区闪电放电过程760~970 nm范围的近红外光谱.光谱特征分析得出: 近红外光谱主要是峰值电流之后、放电后期的辐射, 谱线主要是中性原子的贡献.首次讨论了放电后期的通道温度和光谱总强度沿放电通道的演化特征.结果表明, 通道温度较回击电流上升至峰值阶段降低, 约为16000 K; 不同闪电的光谱结构、通道温度差异不大, 反映了放电等离子体复合阶段的特性; 地闪通道的温度和光谱总强度沿放电通道略呈单调变化趋势, 接地点附近最大; 云闪通道的温度和光谱总强度沿放电通道非单调变化, 在通道的拐弯、分叉以及结点附近发生突变.
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| 关 键 词： | 闪电放电 近红外光谱 通道温度 光谱总强度 |
| 收稿时间： | 2011-07-12 |
Evolution characteristic of near-infrared spectra and temperature along the stroke channel of lightning discharge process |
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| QU Hai-Yan
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YUAN Ping
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ZHANG Hua-Ming
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QIE Xiu-Shu.Evolution characteristic of near-infrared spectra and temperature along the stroke channel of lightning discharge process[J].Chinese Journal of Geophysics,2012,55(8):2508-2513. |
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| Authors: | QU Hai-Yan YUAN Ping ZHANG Hua-Ming QIE Xiu-Shu |
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| Institution: | 1. Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China;2. The Lanzhou Branch of the National Science Library, Chinese Academy of Sciences, Lanzhou 730000, China;3. Thunder Prevention and Observation Center of Shanxi Province,Taiyuan 030002, China;4. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | The near-infrared spectra in the range of 760~970 nm for lightning discharge processes are obtained by using a slit-less infrared spectrograph in Shandong area of China. The spectra analysis shows that the near-infrared spectrum is mainly the radiation from the later stage after the discharge peak current, and the lines of neutral nitrogen and oxygen atoms are the major components of the separation spectrum. Furthermore, the evolution characteristic of the channel temperature and the total intensity of spectra along the channel during near-infrared radiation are discussed for the first time. The results show that the channel temperature decreases to about 16000 K compared with the stage of return stroke current rising to peak; there is little difference for spectral structure and channel temperature of different lightning, which reflects the characteristics of plasma channel in the recombined phase; the channel temperature and the total intensity of spectra along the channel show a slight tendency of monotonic change for cloud-to-ground lightning, reaching the maximum near the ground; the variation is non-monotonic in cloud lightning, and the channel temperature and the total intensity of spectra are suddenly changed in the tortuous positions, branches and crunodes of the channel. |
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| Keywords: | Lightning discharge Near-infrared spectra Channel temperature Total intensity of spectra |
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