NASA's Solar Dynamics Observatory (SDO) captured this image of an M9-class flare on Oct 20, 2012 at 2:14 p.m. EDT. This image shows light at a wavelength of 131 Angstroms, which corresponds to material at 10 million Kelvin, and is a good wavelength for observing flares. This wavelength is typically colorized as teal, as shown here.
To read more go to: www.nasa.gov/mission_pages/sunearth/news/News102012-m9fla...
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