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IRIS Mission to Launch in June

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NASA's IRIS Mission to Launch in June

Lying just above the sun’s surface is an enigmatic region of the solar atmosphere called the interface region. A relatively thin region, just 3,000 to 6,000 miles thick, it pulses with movement: Zones of different temperature and density are scattered throughout, while energy and heat course through the solar material.

Understanding how the energy travels through this region – energy that helps heat the upper layer of the atmosphere, the corona, to temperatures of 1 million kelvins (about 1.8 million F), some thousand times hotter than the sun’s surface itself – is the goal of NASA’s Interface Region Imaging Spectrograph, or IRIS, scheduled to launch on June 26, 2013, from California’s Vandenberg Air Force Base.

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