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BARREL
Balloon Array for RBSP Relativistic Electron Losses (BARREL) is a NASA mission operated out of Dartmouth College that works with the Van Allen Probes mission (formerly known as the Radiation Belt Storm Probes mission).〔 〕 The BARREL project will launch 20 balloons from Antarctica during each of two balloon campaigns in January 2013 and January 2014. Unlike the football-field-sized balloons typically launched at the Poles, these are each just 90 feet in diameter.〔
==Scientific Objectives==
BARREL will help study the Van Allen Radiation Belts and why they wax and wane over time. Each BARREL balloon will carry instruments to measure particles ejected from the Belts which make it all the way to Earth's atmosphere.〔(【引用サイトリンク】url=http://www.nasa.gov/mission_pages/sunearth/news/barrel-antarctica.html )〕 By comparing such data to that of RBSP—which will be up beyond the atmosphere observing the Belts from a closer viewpoint—the two experiments can try to correlate observations in the Radiation Belts with the number of particles ejected.〔 This will help distinguish between various theories of what causes electron loss in the Belts.〔(【引用サイトリンク】url=http://www.dartmouth.edu/~rmillan/barrel.html )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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