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NOAA announced that the solar X-Ray Flux exceeded M5, 2013 May 03 1729 UTC (2:29 pm ET). Here's a view of the peak brightness of the flare from the EVE SAM camera. SAM is pinhole camera that is sensitive to X-rays. The X marks where the flare overwhelmed the CCD.
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Another view showing the flaring region in the upper left limb of an AIA 94 image. The active region that flared has not yet been assigned a number, but keep an eye on it as it rotates into view!