M4.0 Solar Flare Detected; Radio Blackouts Possible Today
GOES satellites measured a M4.0-class solar flare peaking at 2026-07-07T14:19:00Z (X-ray flux 4.0e-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.