Astronomy Picture of the Day——都灵城上空的月华

A Lunar Corona over Turin 
Image Credit & Copyright: Giorgia Hofer (Cortina Astronomical Association)

Explanation: What are those colorful rings around the Moon? A corona. Rings like this will sometimes appear when the Moon is seen through thin clouds. The effect is created by the quantum mechanical diffraction of light around individual, similarly-sized water droplets in an intervening but mostly-transparent cloud. Since light of different colors hasdifferent wavelengths, each color diffracts differently. Lunar Coronae are one of the few quantum mechanical color effects that can be easily seen with the unaided eye. The featured lunar corona was captured around full Moon above Turin, Italy in 2014. Similar coronae that form around the Sun are usually harder to see because of the Sun's great brightness.

都灵城上空的月华

快看，那些围绕着月球的彩色光环是什么？答案是月华。

当我们透过薄薄的云层观看月亮时，有时候就会看到这样的光环。这是由光的量子力学衍射导致的，光环绕在几乎透明的云层中的大小相似的单颗水滴周围，因为不同颜色的光具有不同的波长，所以每种颜色光的折射率不同。月华是少数几个肉眼能观察到的量子力学色彩效应之一。这幅精彩的月华照片拍摄于2014年，地点是意大利都灵。因为太阳过于明亮，所以太阳周围形成的日华现象通常难以观测到。

高清原图地址：

https://apod.nasa.gov/apod/image/1909/LunarCorona_Hofer_3264.jpg

近期文章：

Astronomy Picture of the Day——月球后方的土星

Astronomy Picture of the Day——哈勃首次在系外行星上发现水汽

Astronomy Picture of the Day——丰收月亮

NASA

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