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为什么重新雷击?

雷击的启蒙形象下面是放慢10000帧每秒。可以看出,最强烈的闪光产生闪电发生的方向。为什么最后“地面行动”罢工发生,为什么如此多的光明和速度比最初的击向地面的一部分吗?

在这里输入图像描述

回答

它不是。基于观察和其他cloud-earth闪电的慢动作视频我观察以下几点:1。一些低强度”试点闪电”开始在云中,通常只在一个点或最多几个点,和传播方向远离这一点,拓展就像一条河三角洲或树枝。2。一般的传播方向是向地面,但不是很强烈。最一致的特质的运动距离原点的* *,但是没有绝对的(有一些向上循环和分支机构)。3所示。一旦其中一个分支触摸或接近地面强烈的电弧形式之间的那点在地上,“飞行员闪电”的起源。* *没有明确指示的方向,* *的部分原因是不可避免的相机过载。* *假设* *飞行员闪电开始的梯度非均匀电场最大,接近云中的电荷集中收集。 It does not start on the ground because the ground conducts comparatively well so that the charges dissipate, lowering the electric field strength. The pilot lightning's propagation is driven by two factors: The electric field and a feedback mechanism. The feedback happens because the plasma corridor created by the emerging lightning bolt conducts electricity very well and thus facilitates propagation once it has started: Electrons and ions are accelerated and extend the corridor at its front. Apparently there is a chaotic element to this, possibly because turning air into plasma is an explosive process. This multi-directional explosive expansion is also responsible for the branching. That the lightning roughly follows the field gradient explains the general direction. The feedback sustains the lightning once it has started. The explosive expansion of the heated air explains its chaotic parts. When one of the pilot lightning branches gets close enough to the ground that an arc to the ground is completed there is a completely conductive connection between the separated charges which will lead to the runaway discharge known as a lightning bolt. (It's a runaway process because higher currents increase the arc's conductivity by turning more air into plasma, so the current grows until the charges are exhausted.) **I do not think that the eventual main lightning bolt has a different "direction" than the pilot lightning,** and I cannot find observational evidence. Even at 100,000 frames per second the intensifying [appears instantaneous](https://youtu.be/qQKhIK4pvYo), and the main bolt is so bright that cameras are overloaded. It may appear to the human perception as a "back strike" because it starts once the pilot lightning touches ground, much like a bounce-back event. But I think it's just that suddenly a lot of charges flow where only few charges were flowing a millisecond earlier, in the same direction.

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