连续辐射谱法计算闪电通道电子温度

doi:10.3964/j.issn.1000-0593(2018)04-1209-04

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Abstract Based on the continuous radiation theory, the relation between the energy of the continuous radiation and the electron temperature of the plasma is obtained. According to the spectrum of the lightning return stroke processes in Qinghai area, separating the continuous radiation intensity from it. In order to reduce the calculation error caused by absorption, the absorption characteristics are analyzed. The electron temperature of lightning discharge channel is obtained by fitting the curves of the continuous spectrum intensity. The peak temperature is 29 800 K and the temperature lower limit is 16 200 K. The electron temperature is calculated respectively with the OⅠ line and NⅡ line in the same band spectrum. The comparison shows the electron temperature calculated by the continuous radiation transits from high temperature to low temperature. High temperature values are in good agreement with the temperature of the lightning core current channel calculated by the ion line information, while the low temperature is close to the result of the atomic line calculation, which reflects the temperature of the outer corona discharge channel. Therefore, the results obtained from the continuous spectrum can more fully reflect the distribution of the temperature along the radial direction. For the lightning thermal plasma channel, the continuous spectrum method provides a new way to calculate the electron temperature of lightning discharge channel. It is of great significance to the study of the lightning return stroke.

Key words：Lightning spectra; Continuous radiation; Spectrum separation; Electron temperature

Received: 2016-11-23 Accepted: 2017-05-02

ZTFLH:

O536

Corresponding Authors: YUAN Ping E-mail: yuanp@nwnu.edu.cn

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2018)04-1209-04 OR https://www.gpxygpfx.com/EN/Y2018/V38/I04/1209

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