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It's official: the biggest solar X-ray flare ever is classified as X28
 
6 November 2003

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Solar flare - 4 November 2003
Just as solar scientists were ready to start breathing normally again after the solar activity of October 2003, active region 10486 blasted off yet another mega-flare. This one saturated the X-ray detectors on the NOAA's GOES satellites on 4 November 2003.
 
 
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