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首页> 外文期刊>Journal of atmospheric and solar-terrestrial physics >Computer simulation of the electric field structure and optical emission from cloud-top to the ionosphere
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Computer simulation of the electric field structure and optical emission from cloud-top to the ionosphere

机译：从云顶到电离层的电场结构和光发射的计算机模拟

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摘要

Computer simulations are carried out to study the 'sprite' onset mechanism. Both electrostatic and electromagnetic codes are developed to calculate the electric field structure and optical emission intensity between the top of the thundercloud and the ionosphere. The optical emission is composed of two structures. One peaks at 70 km height and its lateral dimension is 50-60 km; the other peaks at 90 km height and the lateral dimension extends beyond 200 km. It is found that the nitrogen first positive band, which has a red colour, dominates over the nitrogen second positive band except at the bottom of the optical emission. The upper part of the optical emission is caused by a horizontally travelling electromagnetic pulse induced by a lightning discharge current. The lower structure is caused by electrostatic effects induced by the unneutralized charge left after the lightning discharge current flows. The electromagnetic codes developed can simulate the self-consistent response of the upper atmosphere to the lightning discharge current. The electrostatic treatment can predict only the optical emission at heights less than ～80 km. The optical emission intensity has a strong nonlinear dependence on the electric field strength through the enhanced electron density, and is increased for a long discharge path, a large current, and a short pulse. Also, the higher the lightning discharge is initiated, the brighter the optical emission is, because the electrostatic field is stronger for high altitude lightning.
机译：进行计算机模拟以研究“精灵”发作机制。开发了静电和电磁代码，以计算雷云顶部和电离层之间的电场结构和光发射强度。光发射由两个结构组成。 1个山峰在70 km高处，横向尺寸为50-60 km;其他高峰在90 km高度，横向尺寸超过200 km。发现红色的氮第一正带在氮第二正带上占主导地位，除了在光发射的底部。光发射的上部是由雷电放电电流感应的水平传播电磁脉冲引起的。下部结构是由雷电放电电流流过后留下的未中和电荷引起的静电效应引起的。开发的电磁代码可以模拟高层大气对雷电放电电流的自洽响应。静电处理只能预测不到80 km高度的光发射。通过提高的电子密度，光发射强度对电场强度具有很强的非线性依赖性，并且对于长的放电路径，大电流和短脉冲而言，光发射强度增加。同样，引发的雷电放电越高，光发射就越亮，因为对于高海拔雷电，静电场更强。

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