佛罗里达上空的夜光云
(原标题: Noctilucent Clouds over Florida)
2024-07-09
浏览次数: 25
这些云非常不寻常。首先，它们是罕见的夜光云，这意味着它们在晚上是可见的——但只有在日出之前或日落之后。其次，这些夜光云的来源实际上是已知的。在这种罕见的情况下，高层大气中反射阳光的冰晶的来源可以追溯到大约30分钟前附近的SpaceX火箭发射。更正式的名称是极地中间层云，这些冰缕的顶点恰好汇聚在升起的新月前面。这张特色图片和附带的视频是大约一周前在美国佛罗里达州奥兰多市拍摄的。月球右侧的亮点是木星，而右侧地平线上方的星点则来自飞机。
查看原文解释
These clouds are doubly unusual. First, they are rare noctilucent clouds, meaning that they are visible at night -- but only just before sunrise or just after sunset. Second, the source of these noctilucent clouds is actually known. In this rare case, the source of the sunlight-reflecting ice-crystals in the upper atmosphere can be traced back to the launch of a nearby SpaceX rocket about 30 minutes earlier. Known more formally as polar mesospheric clouds, the vertex of these icy wisps happens to converge just in front of a rising crescent Moon. The featured image -- and accompanying video -- were captured over Orlando, Florida, USA about a week ago. The bright spot to the right of the Moon is the planet Jupiter, while the dotted lights above the horizon on the right are from an airplane.
© Pascal Fouquet