Key Takeaways A powerful X-class solar flare on January 18, 2026, triggered a severe geomagnetic storm, reaching G4 levels as reported by NOAA’s SWPC, with fast solar wind and a CME impacting Earth, leading to widespread aurora sightings. Verified data confirms the flare’s intensity at about X1.9, solar wind speeds of 700–800 km/s, an S4 […]