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The AIA channel at 304 Angstroms extreme ultraviolet view shows the singly ionized helium ions, and is especially good at showing areas where cooler dense plumes of plasma are located above the surface of the sun, in the upper chromosphere and the lower transition region. The bright areas show where the plasma has a high density.
February 28, 2013 4:17 PM PST
Photo by: NASA/SDO
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