Calculating the electron temperature in the lightning channel by continuous spectrum
Based on the theory of plasma continuous radiation, the relationship between the emission intensity of bremsstrahlung and recombination radiation and the plasma electron temperature is obtained. During the development process of a return stroke of ground flash, the intensity of continuous radiation...
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| Published in | Plasma science & technology Vol. 19; no. 12; pp. 57 - 61 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
IOP Publishing
01.12.2017
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1009-0630 1009-0630 |
| DOI | 10.1088/2058-6272/aa8acb |
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| Summary: | Based on the theory of plasma continuous radiation, the relationship between the emission intensity of bremsstrahlung and recombination radiation and the plasma electron temperature is obtained. During the development process of a return stroke of ground flash, the intensity of continuous radiation spectrum is separated on the basis of the spectrums with obviously different luminous intensity at two moments. The electron temperature of the lightning discharge channel is obtained through the curve fitting of the continuous spectrum intensity. It is found that electron temperature increases with the increase of wavelength and begins to reduce after the peak. The peak temperature of the two spectra is close to 25 000 K. To be compared with the result of discrete spectrum, the electron temperature is fitted by the O I line and N II line of the spectrum respectively. The comparison shows that the high temperature value is in good agreement with the temperature of the lightning core current channel obtained from the ion line information, and the low temperature at the high band closes to the calculation result of the atomic line, at a low band is lower than the calculation of the atomic line, which reflects the temperature of the luminous channel of the outer corona. |
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| Bibliography: | Xiangcheng DONG,Jianhong CHEN,Xiufang WEI,Ping YUAN（ 1 School of Electronic and Information Engineering, Lanzhou City University, Lanzhou 730070, People＇s Republic of China ;2 College of Physics and Electronic Engineering, Northwest Normal University, Key Laboratory of Atomic and Molecular Physics ＆ Functional Materials of Gansu Province, Lanzhou 730070, People＇s Repubfic of China） lightning spectrum plasma continuous radiation spectral separation electron temperature 34-1187/TL Based on the theory of plasma continuous radiation, the relationship between the emission intensity of bremsstrahlung and recombination radiation and the plasma electron temperature is obtained. During the development process of a return stroke of ground flash, the intensity of continuous radiation spectrum is separated on the basis of the spectrums with obviously different luminous intensity at two moments. The electron temperature of the lightning discharge channel is obtained through the curve fitting of the continuous spectrum intensity. It is found that electron temperature increases with the increase of wavelength and begins to reduce after the peak. The peak temperature of the two spectra is close to 25 000 K. To be compared with the result of discrete spectrum, the electron temperature is fitted by the O I line and N II line of the spectrum respectively. The comparison shows that the high temperature value is in good agreement with the temperature of the lightning core current channel obtained from the ion line information, and the low temperature at the high band closes to the calculation result of the atomic line, at a low band is lower than the calculation of the atomic line, which reflects the temperature of the luminous channel of the outer corona. PST-2017-0140.R2 Institute of Plasma Physics |
| ISSN: | 1009-0630 1009-0630 |
| DOI: | 10.1088/2058-6272/aa8acb |