太阳绿闪的影片

2021年11月10日

Video of a Green Flash
Video Credit & Copyright: Paolo Lazzarotti

Explanation: Many think it is just a myth. Others think it is true but its cause isn’t known. Adventurers pride themselves on having seen it. It’s a green flash from the Sun. The truth is the green flash does exist and its cause is well understood. Just as the setting Sun disappears completely from view, a last glimmer appears startlingly green. The effect is typically visible only from locations with a low, distant horizon, and lasts just a few seconds. A green flash is also visible for a rising Sun, but takes better timing to spot. A dramatic green flash was caught on video last month as the Sun set beyond the Ligurian Sea from Tuscany, Italy. The second sequence in the featured video shows the green flash in real time, while the first is sped up and the last is in slow motion. The Sun itself does not turn partly green — the effect is caused by layers of the Earth’s atmosphere acting like a prism.

Discovery + Outreach: Graduate student research position open for APOD

Tomorrow’s picture: 67P

太阳绿闪的影片
影片提供与版权: Paolo Lazzarotti

说明: 有人认为那只是迷思，另有人认为它是真的，只不过成因不明；而具冒险精神的人，则以曾经目睹为傲。其实太阳的绿闪，是真实存在的现象，而其成因也确知。当落日恰要完全没入地平面的瞬间，那最后一丝的微光，带着令人惊喜的绿色，而且只延续短短数秒。旭日也有绿闪现象，只不过时间点要拿捏得很精准。要观看日盘边缘的绿闪，观测地点通常要有低远的地平面。上面这部摄于上个月的影片，记录太阳沉入意大利托斯卡尼利古里亚海时的精采绿闪景观。这部主题影片的第一部分，以真实的速度重播绿闪，后面的片段则以慢速播放。其实太阳并非真的部分变绿，纯是地球的大气层像三稜鏡折射阳光所造成的效应。

发现+拓展: APOD研究生研究职位空缺

明日的图片: 67P