Signal: Noctilucent clouds more frequent and brighter

Night Shining Clouds are Getting Brighter

by on 31. Mar, 2011 in

http://earthobservatory.nasa.gov/IOTD/view.php?id=48892

Night-Shining clouds brighter and more frequent

Night-Shining clouds brighter and more frequent

by on 04. Feb, 2011 in Uncategorized

After the Sun sets on a summer evening and the sky fades to black, you may be lucky enough to see thin, wavy clouds illuminating the night, such as these seen over Billund, Denmark, on July 15, 2010. Noctilucent or polar mesospheric clouds, form at very high altitudes—between 80 and 85 kilometers (50–53 miles)—which positions [...]