This is a rare phenomenon called iridescent clouds. It occurs in the clouds with ...

volcanic dusts
sulphuric acid
detergent vapors
small droplets or ice crystals
The effect is similar to irisation. Iridescent clouds are a diffraction phenomenon caused by small water droplets or small ice crystals individually scattering light. Larger ice crystals do not produce iridescence, but can cause halos, a different phenomenon.
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volcanic dusts
sulphuric acid
detergent vapors
small droplets or ice crystals
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flagNorway
7%
7%
0%
85%
14
flagLuxembourg
9%
0%
18%
72%
11
flagGermany
12%
9%
10%
68%
66
flagGreece
4%
18%
9%
68%
22
flagCanada
9%
9%
13%
68%
22
flagAustralia
10%
10%
10%
65%
40
flagSingapore
0%
19%
19%
61%
21
flagthe United States
14%
19%
8%
57%
218
flagPoland
15%
15%
11%
56%
21043
flagthe United Kingdom
18%
16%
6%
55%
132
flagthe Netherlands
20%
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13%
53%
15
flagRepublic of Ireland
9%
40%
0%
50%
22
flagIndia
20%
22%
10%
44%
156
flagthe Philippines
42%
21%
0%
36%
19