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Tuesday, May 21, 2013

NASA ISIS to probe the sun's chromosphere


NASA is getting ready to launch a new mission, a mission to observe a mysterious region of the solar atmosphere that may be crucial to understanding what powers space weather.

The Pegasus XL rocket
On June 26, 2013, the Interface Region Imaging Spectrograph, or IRIS, will launch from Vandenberg Air Force Base, Calif. aboard an Orbital Sciences Corporation PegasusXL.

IRIS will tease out the rules governing the lowest layers of the solar atmosphere -- historically some of the hardest to untangle. Known as the solar interface region, this is one of the most complex areas in the sun's atmosphere: all the energy that drives solar activity travels through it.

NASA IRIS mission set for June
The interface region lies between the sun's 6,000-degree, white-hot, visible surface, the photosphere, and the much hotter multi-million-degree upper corona. Interactions between the violently moving plasma and the sun's magnetic field in this area may well be the source of the energy that heats the corona to its million-degree temperatures, some hundreds and occasionally thousands of times hotter than the sun's surface. The chromosphere is also considered a candidate as the origin for giant explosions on the sun such as solar flares and coronal mass ejections.
 
Mission logo design
IRIS will use high-resolution images, data and advanced computer models to unravel how solar gases move, gather energy and heat up through the lower solar atmosphere. Outfitted with state-of-the-art tools, IRIS will be able to tease apart what's happening in the solar interface region better than ever before.

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