印度雨后惊现彩虹云 酷似外星人入侵
乍一看这几乎像是某种天使壁画或是地球之外的启示。但实际上这张照片上天空中出现的“五彩祥云”既不是出自人手，也非什么超自然现象。这是彩虹云，一种正常的大气现象。
这张照片是由一位来自印度的大学生提交给国家地理的，他是一位业余摄影爱好者。照片的拍摄时间是在7月中旬，就在一场夏日的暴风雨之后——这是形成彩虹的良好环境条件。这名大学生名叫哈里希(V. Harish)，他说：“我决定出去拍几张雨后美景的照片。当我在拍摄露珠时，我的朋友看到了天空中的彩色美景。”
彩虹云是云团里的小冰晶散射阳光形成的自然现象，事实上要形成这种神奇的景象所需要的原材料是十分简单的。和常规的彩虹一样，彩虹云的出现一般也伴随着暴风雨。根据大气研究专家列斯·考利(Les Cowley)的说法，彩虹云常常出现在炎热潮湿的午后。究其主要原因，是因为大部分形成彩虹的云团形成于积云的上方，而所谓积云就是大家非常熟悉的，常常在小朋友们的画画中出现的棉花球状云团。
考利表示：“这其中的原因是积云会不断上升，将其上方的空气层也同时向上抬升。随着空气上升，气团会不断膨胀并冷却。有时候这些气团中的水汽成分会迅速凝结，形成水滴云盖。”考利表示：“正是在这个云盖内部的水滴和冰晶对阳光的衍射造成了这种绚丽的色彩。”
不过尽管听起来彩虹的形成机制非常简单，但你会发现它们并不是非常常见，而被拍摄到的几率就更加低了。哈里希表示：“有时候我们几乎会觉得这就是一扇可以让某种外星生命抵达地球的大门。”他在此之前还从未见到过彩虹云。他说：“但是彩虹云的美丽的确打动了我，因此我尽力拍下了尽可能多的照片。”
对此考利也表示，看到彩虹云的确需要好运气，因为它真的不太常见。他说：“并非所有的积云盖层会出现彩虹云，我一般在佛罗里达，东南亚和赤道非洲地区拍到彩虹云的照片比较多一些。”
哈里希表示：“能在印度看到这种现象我感到很幸运，我和我的同伴们到现在还都在开玩笑说那是外星人的入侵！”
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