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Colorful auspicious clouds appear in Hangzhou. Colorful auspicious clouds in the whole network are a

(original title: colorful auspicious clouds appear over Hangzhou. Brush the screen instantly! Netizen: zhizunbao, are you here?)

It is said that Hangzhou is a blessed land, which can be searched for wind, rain and snow. But this afternoon, even a cloud was searched! Is this a little too much?!

At about 1 p.m. on August 8, there were 'colorful auspicious clouds' over Hangzhou. Instantly swipe the screen in the circle of friends! Then boarded the microblog hot search!

At about 1 noon on August 8, there were 'colorful auspicious clouds' over Hangzhou. According to @ Zhejiang weather, 'colorful clouds' is a typical' Rihua 'phenomenon. Under appropriate weather conditions, the sunlight is diffracted by small ice crystals and small water droplets in the cloud, so as to separate the solar spectrum and form colorful light.

What is "Rihua"?

Rihua is an optical phenomenon in the atmosphere. In the translucent thin cloud in the sky, there are many hexagonal columnar ice crystals floating in the air. Occasionally, they are arranged vertically in good order. When sunlight shines on these hexagonal icicles, unconventional refraction will occur. Rihua is blue-green inside and red brown outside. Hua is a diffraction phenomenon. When light passes through small water droplets close to its wavelength, the intensity of light will be distributed alternately, which is diffraction. If the outer circle is only white, it is the solar halo, which is generated by light passing through the cirrus cloud. At this time, it may rain.