ESA - The biggest solar X-ray flare ever is classified as X28
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It has been announced that the massive solar X-ray flare which occurred on 4 November was, at best estimate, an X28. There is still a small chance this will be revised by a small amount, but it is now official: We have a new number 1 X-ray flare for the record books, the most powerful in recorded observational history.
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ESA - The biggest solar X-ray flare ever is classified as X28
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