level 11
拍到过 也在云南
2013年11月23日 04点11分
level 13
level 14
虹彩云Iridescent Clouds，现象叫Cloud iridescence http://en.wikipedia.org/wiki/Cloud_iridescence 最常见的成因是水滴干涉作用，跟日华原理一样，而且实际上也可能是大型日华的一部分
“When parts of clouds are thin and have similar size droplets, diffraction can make them shine with colours like a corona. In fact, the colours are essentially corona fragments. The effect is called cloud iridescence or irisation, terms derived from Iris the Greek personification of the rainbow.
The usually delicate colours can be in almost random patches or bands at cloud edges. They are only organised into coronal rings when the droplet size is uniform right across the cloud. The bands and colours change or come and go as the cloud evolves. They occur most often in altocumulus, cirrocumulus and especially in lenticular clouds. Iridescence is seen mostly when part of a cloud is forming because then all the droplets have a similar history and consequently have a similar size.
Sometimes iridescence can be seen far from the sun but is most frequent near to it. As for coronas, search safely by hiding the sun behind a building and, even better, also viewing the reflection of the sky in water.” http://atoptics.co.uk/droplets/irid1.htm
位在距太阳附近的云上。彩云的形成为一种“衍射现象”，其云彩为大型日华的片段，但比例过小，无法观察出圆弧。 中文维基页
APOD相关照片http://asterisk.apod.com/viewtopic.php?t=24970
2013年11月23日 05点11分
6
“When parts of clouds are thin and have similar size droplets, diffraction can make them shine with colours like a corona. In fact, the colours are essentially corona fragments. The effect is called cloud iridescence or irisation, terms derived from Iris the Greek personification of the rainbow.
The usually delicate colours can be in almost random patches or bands at cloud edges. They are only organised into coronal rings when the droplet size is uniform right across the cloud. The bands and colours change or come and go as the cloud evolves. They occur most often in altocumulus, cirrocumulus and especially in lenticular clouds. Iridescence is seen mostly when part of a cloud is forming because then all the droplets have a similar history and consequently have a similar size.
Sometimes iridescence can be seen far from the sun but is most frequent near to it. As for coronas, search safely by hiding the sun behind a building and, even better, also viewing the reflection of the sky in water.” http://atoptics.co.uk/droplets/irid1.htm
位在距太阳附近的云上。彩云的形成为一种“衍射现象”，其云彩为大型日华的片段，但比例过小，无法观察出圆弧。 中文维基页
APOD相关照片http://asterisk.apod.com/viewtopic.php?t=24970
![[惊讶]](/static/emoticons/u60cau8bb6.png)
level 7
彩云之南
2013年11月23日 09点11分
10
月亮之上怎么解释![[怒]](/static/emoticons/u6012.png)
2013年11月23日 10点11分
回复 哥特式一夜 :那是你在遥望。
2013年11月23日 11点11分
![[汗]](/static/emoticons/u6c57.png)
云南取彩云之南的意思
+1
2013年11月24日 02点11分
level 13
![[泪奔]](/static/emoticons/u6ceau5954.png)
