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M2.5 Solar Flare Detected on the Sun

GOES satellites measured a M2.5-class solar flare peaking at 2026-07-20T14:36:00Z (X-ray flux 2.5e-5 W/m2, radio-blackout scale ~R1). Flares cause immediate shortwave radio blackouts on Earth's sunlit side. If this flare launched a CME toward Earth, a geomagnetic storm could follow in 1-3 days - worth watching the Kp index.

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