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COLOR IMAGE of a Red Sprite on July 4, 1994 at 04:00:20 UTC, which reached an altitude of over 85 km. The tendrils beneath the sprite are as low as 60 km. The bright area beneath the sprite is an over-exposure of normal lightning occuring in the top portion of an active thunderstorm complex located in the Texas panhandle. Cloud tops in were about 18 km. 

Image:Geophysical Institute team at the University of Alaska, Fairbanks. 

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