Astronomy Picture of the Day——火山上空的闪电
Lightning over the Volcano of Water
Image Credit & Copyright: Sergio Montúfar
Explanation: Have you ever watched a lightning storm in awe? Join the crowd. Details of what causes lightning are still being researched, but it is known that inside some clouds, internal updrafts cause collisions between ice and snowthat slowly separate charges between cloud tops and bottoms The rapid electrical discharges that are lightning soon result. Lightning usually takes a jagged course, rapidly heating a thin column of air to about three times the surface temperature of the Sun. The resulting shock wave starts supersonically and decays into the loud sound known as thunder. On average, around the world, about 6,000 lightning bolts occur between clouds and the Earth every minute.Pictured earlier this month in a two-image composite, lightning stems from communication antennas near the top of Volcán de Agua (Volcano of Water) in Guatemala.
水火山上空的闪电
你曾敬畏地观看过闪电风暴吗？加入观赏者的行列吧。闪电形成的具体原因依然在研究中，但众所周知的是，一些云层中的内部上升气流会引起冰和雪之间的碰撞，并缓慢地分离云顶和云底之间的电荷，从而很快产生了快速放电，即闪电。闪电通常呈锯齿状分布，它会将一股稀薄的空气柱迅速加热到太阳表面温度的三倍左右。由此产生的冲击波以超音速传播，然后衰减为响亮的雷声。在世界各地，在云层和地表之间平均每分钟大约有6000次闪电发生。以上这幅照片拍摄于本月早些时候，它由两张照片组合而成的，呈现了来自危地马拉水火山顶部附近通信天线的闪电。
参考文献：
https://apod.nasa.gov/apod/image/1907/LightningVolcano_Montufar_1440.jpg
近期文章：
Astronomy Picture of the Day——天空的脉络