拉普兰上空的珍珠云
(原标题: Nacreous Clouds over Lapland)
2023-02-09
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生动而有光泽的，飘浮的彩虹色波浪穿过芬兰Kilpisjärvi的天空。它们被称为珠母云或珍珠母云，非常罕见。但1月24日日落时，他们在北纬69度的南面拍摄到了令人难忘的景象。极地平流层云的一种，当平流层下层通常无云的异常低温形成冰晶时，它们就形成了。在大约15到25公里的高度仍然被阳光照射，即使在日落之后和黎明之前，云层也可以衍射阳光。
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Vivid and lustrous, wafting iridescent waves of color wash across this skyscape from Kilpisjärvi, Finland. Known as nacreous clouds or mother-of-pearl clouds, they are rare. But their unforgettable appearance was captured looking south at 69 degrees north latitude at sunset on January 24. A type of polar stratospheric cloud, they form when unusually cold temperatures in the usually cloudless lower stratosphere form ice crystals. Still sunlit at altitudes of around 15 to 25 kilometers, the clouds can diffract sunlight even after sunset and just before the dawn.
© Dennis Lehtonen