new icn messageflickr-free-ic3d pan white
Admiring the noctilucent clouds... | by Fly For Fun
Back to photostream

Admiring the noctilucent clouds...

From Wikipedia:

 

en.wikipedia.org/wiki/Noctilucent_cloud

 

They are the highest clouds in the Earth's atmosphere, located in the

mesosphere at altitudes of around 75 to 85 kilometers (47 to 53 mi).

They are normally too faint to be seen, and are visible only when

illuminated by sunlight from below the horizon while the lower layers

of the atmosphere are in the Earth's shadow. Noctilucent clouds are

not fully understood as a meteorological phenomenon. Clouds generally are

not able to reach such high altitudes with such thin air pressures.

 

This was the first time the Captain or I had ever seen them.

10,574 views
67 faves
22 comments
Taken on July 22, 2008