Comment on the transmission‐line model for computing radiation from lightning
Comment on the transmission‐line model for computing radiation from lightning
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DOI：
10.1029/91jd02817
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发表时间：
1992-02
影响因子：
--
通讯作者：
D. Vine;J. Willett
中科院分区：
文献类型：
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作者：
D. Vine;J. Willett
摘要：“传输线”模型是一种近似模型，经常用于将雷电放电期间辐射的电场和磁场与产生这些场的电流联系起来。该模型的主要预测是，远距离（辐射）场与沿闪电通道传播的电流乘以传播速度成正比。本文详细探讨了这种关系的推导及其含义。我们表明，通常用于描述传输线模型的公式不能正确应用于许多闪电过程。当通道的方向不垂直于观察者的视线时，需要一个重要的校正因子，除非传播速度只是光速的一小部分。该模型的这个更通用版本的一个重要含义是电流和速度解耦，以便可以通过适当的多站测量单独确定它们。
Abstract : The 'transmission-line' model is an approximation that is frequently used to relate the electric and magnetic fields radiated during lightning discharges to the currents that produce those fields. A principal prediction of this model is that the distant (radiation) fields are directly proportional to the current propagating along the lightning channel, multiplied by the velocity of propagation. This paper examines the derivation of this relationship and its implications in some detail. We show that the formulas commonly used to describe the transmission-line model cannot be correctly applied to many lightning processes. A correction factor is required that is significant when the channel is not oriented perpendicular to the line of sight to the observer, unless the propagation velocity is only a small fraction of the speed of light. An important implication of this more general version of the model is that the current and velocity decouple so that they could be separately determined by suitable, multistation measurements.