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.

Answers distribution

volcanic dusts
sulphuric acid
detergent vapors
small droplets or ice crystals
answers
flagSpain
14%
0%
0%
85%
14
flagNorway
17%
3%
3%
75%
29
flagBelgium
8%
8%
0%
75%
12
flagthe Netherlands
11%
11%
3%
74%
54
flagthe United States
7%
13%
5%
72%
140
flagLithuania
9%
9%
9%
72%
11
flagGermany
8%
10%
8%
71%
161
flagCanada
23%
5%
0%
70%
17
flagSweden
12%
6%
12%
68%
16
flagIndia
3%
15%
12%
66%
33
flagthe United Kingdom
15%
13%
7%
63%
283
flagFrance
15%
5%
10%
63%
58
flagAustralia
9%
27%
0%
63%
11
flagUkraine
9%
9%
18%
63%
11
flagPoland
13%
14%
10%
60%
16842
flagRepublic of Ireland
6%
22%
11%
60%
45
flagCzech Republic
0%
16%
16%
58%
12
flagUnknown
14%
18%
14%
52%
1127
flagItaly
18%
22%
7%
51%
27
flagDenmark
21%
14%
21%
42%
14

Gender

men57%
women58%
volcanic dusts
13%
13%
sulphuric acid
16%
16%
detergent vapors
12%
10%
small droplets or ice crystals
57%
58%

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