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利用高速无狭缝光栅摄谱仪捕获到的一次闪电光谱资料, 结合等离子体光谱理论, 选用不同波段的光谱信息估算了闪电回击通道温度. 结果表明: 用不同波段的谱线组—单电离氮原子(NII)、中性氧原子(OI)和中性氮原子(NI), 基于玻尔兹曼图法估算的闪电回击通道平均温度分别为43270 K, 17660 K和17730 K; 同时用NII和NI两个谱线组, 基于萨哈-玻尔兹曼图法估算得到的闪电回击通道平均温度为24770 K. 依据闪电通道电晕鞘模型和光谱辐射理论推断, 单独选用NII谱线组获得的温度应该是闪电回击通道核心的温度, 单独选用NI或OI谱线组获得的温度应该是围绕在闪电回击通道核心周围电晕鞘的温度; 同时选用NII和NI谱线组, 获得的温度应该是在曝光时间内整个通道截面(包括通道核心和电晕鞘)的平均温度.The spectral data of a lightning discharge process are captured by a high-speed slit-less grating spectrograph. Based on the plasma spectrum theory, the lightning return stroke channel temperature is estimated according to the spectral information of the different bands. The results show that the average temperatures of the lightning return stroke channel estimated by the Boltzmann plot method are 43270, 17660 and 17730 K, respectively, when the spectral line group of the single ionized nitrogen atom (NII), neutral oxygen atom (OI) and neutral nitrogen atom (NI) are selected respectively. The average temperature of the lightning return stroke channel is 24770 K, which is estimated based on the Saha-Boltzmann plot method by using NII and NI spectral line groups. Based on the lightning channel corona sheath model and the spectral radiation theory, it can be inferred that the temperature obtained by using only NII spectral line group should be the temperature of the lightning return stroke channel core, and the temperature obtained by using only NI or OI spectral line group should be the temperature of the corona sheath around the lightning return stroke channel core. Using both NII and NI spectral line groups, the obtained temperature should be the average temperature of the entire channel section (including the channel core and corona sheath) in the exposure time.
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Keywords:
- spectral diagnosis /
- lightning return stroke channel temperature /
- Boltzmann plot method /
- Saha-Boltzmann plot method
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表 1 不同谱线组估算所得的六个采样点的温度(单位: K)
Table 1. Temperature of six sampling points estimated by different spectral line groups (unit: K).
谱线组 1 2 3 4 5 6 平均值 NII 43680 42850 43250 44410 42980 42440 43270 NI 18600 42850 17170 16710 17300 18990 17660 OI 17520 17130 18190 17690 17200 18220 17730 NII和NI 24800 25110 24780 24710 24530 24670 24770 
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[1] Prueitt M L 1963 J. Geophys. Res. 68 803
Google Scholar
[2] Orville R E 1968 J. Atmos. Sci. 25 839
Google Scholar
[3] Uman M A 1969 J. Geophys. Res. 74 4
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Google Scholar
[5] 欧阳玉花, 袁萍, 贾向东 2006 西北师范大学学报(自然科学版) 42 49
Ouyang Y H, Yuan P, Jia X D 2006 J. Northwest Normal Univ. (Natural Science) 42 49
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Google Scholar
[9] Griem H R 1964 Plasma Spectroscopy (New York: McGraw-Hill) pp267–295
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[11] Yalcin X, Crosley D R, Smith G P, Faris G W 1998 Appl. Phys. B 68 121
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Google Scholar
[13] Cen J Y, Yuan P, Xue S M, Wang X J 2015 Appl. Phys. Lett. 106 054104
Google Scholar
[14] 王雪娟, 袁萍, 岑建勇, 张廷龙, 薛思敏, 赵金翠, 许鹤 2013 62 109201
Google Scholar
Wang X J, Yuan P, Cen J Y, Zhang T L, Xue S M, Zhao J C, Xu H 2013 Acta Phys. Sin. 62 109201
Google Scholar
[15] 王雪娟 许伟群 王海通 杨静 袁萍 张其林 化乐彦 张袁瞰 2021 70 099202
Google Scholar
Wang X J, Xu W Q, Wang H T, Yang J, Yuan P, Zhang Q L, Hua L Y, Zhang Y K 2021 Acta Phys. Sin. 70 099202
Google Scholar
[16] Dong C X, Yuan P, Cen J Y, Wang X J, Mu Y L 2016 Atmos. Res. 178–179 1
[17] Maslowski G, Rakov V A 2006 J. Geophys. Res. 111 D14110
Google Scholar
[18] Cvetic J, Heidler F, Markovic S, Radosavljevic R, Osmokrovic P 2012 Atmos. Res. 117 122
Google Scholar
[19] Maslowski G, Rakov V A 2013 Atmos. Res. 129–130 117
[20] Ignjatovic M, Cvetic J, Heidler F, Markovic S, Djuric R 2014 Atmos. Res. 149 333
Google Scholar
[21] Wang X J, Yuan P, Cen J Y, Liu G R 2016 J. Geophys. Res. Atmos. 121 8615
Google Scholar
[22] Wang X J, Yuan P, Cen J Y, Liu G R 2017 J. Geophys. Res. Atmos. 122 4993
Google Scholar
[23] Liu G R, Yuan P, An T T, Cen J Y, Wang X J 2019 Appl. Phys. Lett. 115 064103
Google Scholar
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