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World's oldest trees reveal the largest solar storm in history
Solar flare - Wikiwand
ESA - The biggest solar X-ray flare ever is classified as X28
Are Your Gadgets Safe from Solar Storms and Nuclear Attacks? « Mad Science :: WonderHowTo
No Bad Flare Days for the Sun – Today's New Reason to Believe
If the Biggest Solar Storm in History Happened Today
List of solar storms - Wikipedia
Solar flare, National Aeronautics and Space Administration Wiki
Massive solar eruption captured in unprecedented image
NOAA: Geostorm Warming as recent solar flares hit Earth •