SPACE PHOTOS

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Ref : V02648

Theme :  Earth in Space  (419 images)

Title : Polar Stratospheric Clouds

Caption :

The Earth. Polar stratospheric clouds form at extremely low temperatures in the upper atmosphere. Should the temperature rise, clouds won't form. In this visualization, sequential temperature readings taken in the research area are plotted against a threshold temperature for PSC formation. These are clouds essentially made of nitric acid. Note how the area covered by the clouds increases as winter progresses. The red point on the map indicates the location of Kiruna, Sweden. Polar stratospheric cloud regions for January 15, 2000.



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