File:Noctilucent clouds.jpg
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| Description |
Taken from the International Space Station. Noctilucent clouds are very high clouds that look like cirrus clouds, but are much higher (75-90 km above the Earth’s surface) than clouds that we observe every day. They are optically thin and can only be observed during twilight hours, when the sun is just below the horizon and only shines on the uppermost atmosphere. In this image, the limb of the Earth at the bottom transitions into the orange-colored troposphere, the lowest and most dense portion of the Earth’s atmosphere. The troposphere ends abruptly at the tropopause, which appears in the image as the sharp boundary between the orange- and blue- colored atmosphere. The silvery-blue noctilucent clouds are far above this boundary. This image was when the ISS was over central Asia. June and July is the season for noctilucent clouds in the northern hemisphere—they form in the polar mesosphere, generally above 50 degrees latitude. Recent studies address why noctilucent clouds exist, whether the frequency of occurrence has increased throughout the 20th century (some researchers believe they have), and whether their frequency reflects human activities. |
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| Date | Taken on 27 July 2003 | |||
| Source | Archived source link | |||
| Author | Ed Lu, NASA astronaut | |||
| Permission (Reusing this file) |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 06:19, 9 January 2016 | | 3,032 × 2,003 (579 KB) | PlanetUser (talk | contribs) | Cropped 3 % vertically using CropTool with precise mode. -- cropping border |
| 06:16, 9 January 2016 |  | 3,032 × 2,064 (591 KB) | PlanetUser (talk | contribs) | original source from http://spaceflight.nasa.gov/gallery/images/station/crew-7/hires/iss007e10974.jpg | |
| 11:47, 10 July 2005 |  | 540 × 405 (12 KB) | Saperaud~commonswiki (talk | contribs) | *en: noctilucent cloud *de: Leuchtende Nachtwolke *astronaut Ed Lu on board of the International Space Station (ISS) 27. Juli 2003 *original upload 15. Okt 2004 in german wikipedia by de:Benutzer:Zinnmann Source: http://earth.jsc.nasa.gov/sseop/efs/ |
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