SITE VISITS: Chasing Sprites

Science  10 Dec 1999:
Vol. 286, Issue 5447, pp. 2039c
DOI: 10.1126/science.286.5447.2039c

Watching a summer lightning storm from your porch can be a thrill, but above the thunderclouds, mostly out of sight, a show of Olympic proportions sometimes takes place: gigantic tongues of red licking as high as 90 kilometers into the ionosphere before disappearing an instant later. Discovered only 10 years ago by physicists testing a low-light video camera from an observatory, the eerie red sprites, beams of light called blue jets, and related phenomena are now being studied intensely to figure out their role in the planet's electrical circuitry.

Find out more at this University of Alaska, Fairbanks, site which offers background, links to magazine articles, a bibliography, and images, including the first color photo of a sprite taken on 4 July 1994 (no, it was not an errant firework). In the vernacular of physics, the phenomena are described as upper atmospheric flashes excited by thunderstorms; but the Fairbanks researchers decided on the more lyrical term sprites over pie and coffee one winter evening in 1993, says the site, which also has a form for reporting sprite sightings. From the team's main page, you can leap to info about the Sprites 99 Field Campaign, which sent a balloon above the Midwest in August to capture sprites on video. This collaborators' site includes images from last summer as well as an essay that offers instructions for howif you live in the high plainsyou can look for sprites from your back porch.

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