A complete loop of the aurora borealis,the Northern Lights,is seen in this false-colour picture recorded from space by the Dynamics Explorer 1 satellite on 15 September 1981. The auroral oval is seen encircling the north pole. The bright area at right is the sunlit portion of the Earth. Auroras are luminous displays that occur in the night sky at high latitudes; they form rays,bands,arcs,streamers & curtains,often coloured red or green. They are caused by subatomic particles from the Sun interacting with atoms & molecules in Earth's upper atmosphere (above about 100 km) | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / NASA |
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