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Solar activity continued on May 14, 2013, as the sun emitted a fourth X-class flare from its upper left limb, peaking at 9:48 p.m. EDT. This flare is classified as an X1.2 flare and it is the 18th X-class flare of the current solar cycle. The flare caused a radio blackout - categorized as an R3, or strong, on NOAA's space weather scales from R1 to R5 -- which has since subsided. [Source: NASA/SDO/GSFC ]
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