Nacreous clouds
Nacreous clouds, sometimes called mother-of-pearl clouds, are rare but once seen are never forgotten. They are mostly visible within two hours after sunset or before dawn when they blaze unbelievably bright with vivid and slowly shifting iridescent colours. They are filmy sheets slowly curling and uncurling, stretching and contracting in the semi-dark sky. Compared with dark scudding low altitude clouds that might be present, nacreous clouds stand majestically in almost the same place - an indicator of their great height.
They need the very frigid regions of the lower stratosphere some 15 - 25 km (9 -16 mile) high and well above tropospheric clouds. They are so bright after sunset and before dawn because at those heights they are still sunlit.
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Information
| Section | Nature: Skies |
| Views | 3,495 |
| Published | |
| Language |
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Exif
| Camera | Canon EOS 5D |
| Lens | --- |
| Aperture | 10 |
| Exposure time | 1/250 |
| Focus length | 45.0 mm |
| ISO | 100 |
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Pawel Majewski 27/02/2011 14:54
Great technic of this photo. I like mood here... Thanks for information below.j.a.j.jansen m. 10/01/2011 17:15
Very nice.Jan.