new icn messageflickr-free-ic3d pan white
Night-Shining Clouds Over the English Channel (NASA, International Space Station, 08/02/11) [Explored] | by NASA's Marshall Space Flight Center
Back to group

Night-Shining Clouds Over the English Channel (NASA, International Space Station, 08/02/11) [Explored]

Editor's note: Hey, thanks for letting me know this had made Explore, everyone! Really appreciate all the comments and traffic on on images. Y'all are the best Flickr friends ever! :)


This photograph of polar mesospheric clouds was acquired at an altitude of just over 202 nautical miles (about 322 kilometers) in the evening hours (03:19:54 Greenwich Mean Time) on Aug. 2, 2011, as the International Space Station was passing over the English Channel. The nadir coordinates of the station were 49.1 degrees north latitude and 5.5 degrees west longitude. Polar mesospheric clouds (also known as noctilucent, or "night-shining" clouds) are transient, upper atmospheric phenomena that are usually observed in the summer months at high latitudes (greater than 50 degrees) of both the Northern and Southern Hemispheres. They appear bright and cloudlike while in deep twilight. They are illuminated by sunlight when the lower layers of the atmosphere are in the darkness of Earth's shadow. The horizon of Earth appears at the bottom of the image, with some layers of the lower atmosphere already illuminated by the rising sun. The higher, bluish-colored clouds look much like wispy cirrus clouds, which can be found as high as 60,000 feet (18 kilometers) in the atmosphere. However noctilucent clouds, as seen here, are observed in the mesosphere at altitudes of 250,000 to 280,000 feet (about 76 to 85 kilometers). Astronaut observations of polar mesospheric clouds over northern Europe in the summer are not uncommon.


Image credit: NASA


Original image:


More about space station research:


There's a Flickr group about Space Station Research. Please feel welcome to join!


View almost 400 photos like this in the "NASA Earth Images" Flickr photoset:

105 faves
Taken on August 2, 2011