天文·每日一图——美国佛罗里达州上空的夜光云
文摘
2024-07-09 15:54
广东
Noctilucent Clouds over FloridaCredit & Copyright: Pascal FouquetExplanation: 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.
说明: 这团云有二个不寻常之处。首先，它是罕见的夜光云，意即它是夜晚才可见的云种，而且可见时段紧在日出前或日落后。其次，这团夜光云的起源已知。在此一稀有的案例里，这片在高层大气中反射阳光的冰晶之来源，可以回溯到大约30分钟前，于附近发射的一枚太空探险公司的火箭。这团正式名称为极地中气层云的冰晶云，其絮丝状涡旋的核心恰好位于东升的新月前方。这张主题影像和附随的影片，是大约在一星期前摄于美国佛罗里达州的奥兰多市。月亮右方的光点是木星，而右侧地平线上方的虚线状光迹则是来自一架飞机。
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