ความคิดเห็นที่ 13
NASA predicts weak Solar Cycle 25 Wednesday, March 28, 2007
May 10, 2006: The Suns Great Conveyor Belt has slowed to a record-low crawl, according to research by NASA solar physicist David Hathaway. Its off the bottom of the charts, he says. This has important repercussions for future solar activity.
The Great Conveyor Belt is a massive circulating current of fire (hot plasma) within the Sun. It has two branches, north and south, each taking about 40 years to perform one complete circuit. Researchers believe the turning of the belt controls the sunspot cycle, and thats why the slowdown is important.
Normally, the conveyor belt moves about 1 meter per secondâwalking pace, says Hathaway. Thats how it has been since the late 19th century. In recent years, however, the belt has decelerated to 0.75 m/s in the north and 0.35 m/s in the south. Weve never seen speeds so low.
According to theory and observation, the speed of the belt foretells the intensity of sunspot activity ~20 years in the future. A slow belt means lower solar activity; a fast belt means stronger activity.
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