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Earth was just hit by the strongest solar radiation storm in over 20 years — here’s what it means

Earth just experienced a rare S4 solar radiation storm, the most intense since 2003 — powerful for satellites and astronauts, but harmless on the ground.

Astrobitica January 20, 2026 (Last updated: January 20, 2026) 1 minute read

Earth just experienced a rare S4 solar radiation storm, the most intense since 2003 — powerful for satellites and astronauts, but harmless on the ground.

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