导读：天空中拥有缤纷颜色的云朵是幻日现象所致，幻日现象让云朵增添不少美丽的色彩。来自美国科罗拉多州（Colorado）的摄影师Arn年约22岁，日前在Heyworth拍摄到一朵拥有彩虹般颜色缤纷的云朵。据悉，这是罕见的天气现象称为“幻日”（sundog）是太阳折射六角形冰晶所致，而这次刚好六角形冰晶已经转变成云朵，才会出现彩虹光芒。Arn表示，很荣幸可以见证到这个不可思议的现象，并且将它拍摄下来，曾经遇到过类似的事情就是看到“幻月”（moondog），但当时所依靠的是月光，而不是太阳光。

Ever heard of a technicloured raincloud before? No, neither had we!On first sight, it looks like a rainbow, but the colourful spectacle is actually a rare weather phenomenon called a sundog.It is caused when the sun refracts through hexagonal-shaped ice crystals that have formed in clouds.And it is extremely rare.Photographer Robert Arn, spotted the awesome scene while driving in Heyworth, Illinois, America, and quickly pulled over to take a snap.Robert, 22, from Colorado, The Sun: 'At the time that I captured this image, I was just starting to get serious with photography.'So being lucky enough to bear witness and photograph this phenomenon was incredible.
'The most similar thing I have observed is a moondog, which uses moonlight instead of sunlight.'

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