Calculating the electron temperature in the lightning channel by continuous spectrum

Xiangcheng DONG (董向成); Jianhong CHEN (陈建宏); Xiufang WEI (魏秀芳); PingYUAN (袁萍)

doi:10.1088/2058-6272/aa8acb

Plasma Science and Technology > 2017 > 19(12): 125304. > DOI: 10.1088/2058-6272/aa8acb

Xiangcheng DONG (董向成), Jianhong CHEN (陈建宏), Xiufang WEI (魏秀芳), PingYUAN (袁萍). Calculating the electron temperature in the lightning channel by continuous spectrum[J]. Plasma Science and Technology, 2017, 19(12): 125304. DOI: 10.1088/2058-6272/aa8acb

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Calculating the electron temperature in the lightning channel by continuous spectrum

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 Republic of China

Funds: This research is supported by National Natural Science Foundation of China (Grant No. 11647150), Young Talents Program of Gansu Province of China (2016) and Scientific Research Program of the Higher Education Institutions of Gansu Province of China (Grant No. 2016A-068).

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Received Date: June 08, 2017

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Abstract

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 re?ects the temperature of the luminous channel of the outer corona.
- lightning spectrum,
- plasma continuous radiation,
- spectral separation,
- electron temperature

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Calculating the electron temperature in the lightning channel by continuous spectrum