都灵上空的月华

2019 September 16

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 has different 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.

都灵上空的月华
影像来源与版权: Giorgia Hofer (Cortina Astronomical Association)

说明：那些围绕着月球的彩色光环是什么？是月华。当我们透过薄云看到月球时，有时会看到这样的光环。这种效应是由光的量子力学衍射产生的，而光环绕在居间但几乎透明的云层中、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，所以每种颜色光的衍射不同。月华是少数几个肉眼可以很容易看到的量子力学色彩效应之一。这幅精彩的月华影像是2014年在意大利都灵上空满月附近拍摄的。因为太阳非常明亮，所以太阳周围形成的类似日华通常很难看到。