On August 31, 2012 a long filament of solar material that had been hovering
in the sun’s atmosphere, the corona, erupted out into space at 4:36 p.m. EDT.
The coronal mass ejection, or CME, traveled at over 900 miles per second.
The CME did not travel directly toward Earth, but did connect with Earth’s
magnetic environment, or magnetosphere, causing aurora to appear on the night
of Monday, September 3. The incredible image above is a lighten blended
version of the 304 and 171 angstrom wavelengths.
Source: Twisted Sifter
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