云层上的闪电现象 80年前,以雾室实验闻名的C.T.R.Wilson曾预测,在雷雨云的顶部与上层大气之间存在着放电现象。此后,人们观测到两种类型的闪电:一种被称为“妖怪”,从电离层向下射出;另一种为锥形的“蓝色喷射流”,从雷雨云顶部向上升。本期的封面图片来自一次不易观测的事件的录像,它向人们展示了雷雨云与电离层下层之间的电接触的一个直接 Lightning Phenomena in the Clouds 80 years ago, C.T.R. Wilson, best known for experiments in the fog chamber, predicted that there was a discharge between the top of the thunderstorm cloud and the upper atmosphere. Since then, two types of lightning have been observed: one called “monsters” that shoot down from the ionosphere, and the other a “jet of blue,” which tapers up from the top of a thunderstorm cloud. This issue of the cover image comes from a video of a less observable event that shows people a direct contact with the electrical contact between the thunderstorm and the lower ionosphere