Wave of Ionization Sweeps Earth After Solar Flare

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Ultraviolet radiation swept Earth’s upper atmosphere on February 18, following an M1.9 class flare the preceding day. The flare came from new sunspot AR1675; it was the most intense flare of 2013 so far, although it did not produce a cornoal mass ejection.

Here it is, in a range of wavelengths:

 

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