Giant red blobs, picket fences, upward branching carrots, and tentacled octopi - these are just a few of the phrases used to describe sprites - spectacular, eerie flashes of colored light high above the tops of powerful thunderstorms that can travel up to 50 miles high in the atmosphere.
Sprites, so-named by a University of Alaska scientist inspired by the creatures in Shakespeare's "The Tempest," have been observed since the 1800s, though rarely visible from the ground. Aircraft pilots began reporting sightings of sprites in the 1950s and '60s, but they were not formally identified until 1989 when the Space Shuttle (STS-34) recorded the flashes as it passed over a thunderstorm in northern Australia. While many theories have been offered on the cause of this rare phenomenon, new NASA-funded research is settling the mystery and helping to determine the driving force behind these marvel displays of light.
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| ©ISUAL Project, NCKU/NSPO, Taiwan |
| This dramatic, garishly colored image was captured with a low-light level camera on June 7, 2001. It shows what appears to be a "burning tree", or red sprite, above the National Cheng Kung University campus in Tainan City, Taiwan. |
