圖片是太空站的：
Image Caption: A sprite glows red in this image captured by astronauts on the International Space Station on April 30, 2012.
Credit: Image Science & Analysis Laboratory, NASA Johnson Space Center
Rare electromagnetic bursts called 'sprites' that appear above thunderstorms were filmed by Japan's NHK television
at 10,000 frames per second. In April 2012, the International Space Station also captured the illusive phenomena above Southeast Asia.
Indeed, sprites are so hard to catch on film, that pilots had claimed to see them for almost a century before scientists at the University of Minnesota accidentally caught one on camera in July of 1989.
還找到了圖片~~網址：http://www.sky-fire.tv/index.cgi/spritegallery.html
Since then, researchers aboard planes have occasionally snapped a shot, but it continues to be difficult to methodically film them. So a group of scientists, along with help from Japan's NHK television, sought them out regularly for two weeks in the summer of 2011.
Filming at 10,000 frames per second on two separate jets, the team recorded some of the best movies of sprites ever taken – movies that can be used to study this poorly understood phenomenon and the forces that create them. By filming from two jets flying 12 miles apart, the team mapped out the 3-dimensional nature of the sprites. Ground-based measurements rounded out the picture.
"Seeing these are spectacular," says Hans C. Stenbaek-Nielsen, a geophysicist at the University of Alaska in Fairbanks, Alaska. "But we need the movies, because not only are they so fast that you could blink and miss them, but they emit most of their light in red, where the human eye is relatively blind."
During those two weeks, the scientists hopped into their planes in Denver, Colo. each evening and chased storm clouds. Just figuring out which direction to fly next was a full time job, assigned to a single person with a computer watching the weather systems. Once a plane found a hot zone of sprites, however, they often lucked into filming numerous sprites in a row. The sprite's first flash is usually followed by a break up into numerous streamers of light – figuring out what causes this divergence is one of the key things researchers will try to understand from these films.
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發表於 2012-8-17 08:15:02
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發表於 2012-8-19 00:28:53
