Nacreous Clouds - take 2

Saturday, January 19th 2008, 18:16 CET
Skien, Norway

Finally another sighting of those rare nacreous clouds. More on flickr .

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Comments

Ivo
Sunday, January 20th 2008, 09:02 UTC

Is this related to the northern light effect?

Derick
Sunday, January 20th 2008, 19:24 UTC

No, not linked at all. Northern lights are caused by particles from the Sun, while this type of clouds is still unclear what it actually is. NASA just launched a mission to found out more about it (http://en.wikipedia.org/wiki/Aeronomy_of_Ice_in_the_Mesosphere).

Rob Benedict
Friday, December 24th 2010, 12:04 UTC

Nacreous clouds or mother of pearl clouds will only be seen just after sunset or before sunrise, they form in the stratosphere at heights of between 6-18 miles when the temperature there falls below -80°C and are ‘probably’ composed of ice particles with a liquid coating of nitric acid tri-hydrate. They appear bright because they are high enough to be illuminated by the sun long after local sunset and the pastel colours arise through diffraction or interference effects in much the same way that colours appear in a film of oil on a puddle of water. Aurora borealis (northern lights) & aurora australis is the emissions of photons in the Earth's upper atmosphere & not connected to these clouds formations.

Rob Benedict (UK)

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