THE CME HAS ARRIVED, AND THE STORM HAS BEGUN: The CME launched by Tuesday's X-flare has just reached Earth. It appears to be as potent as advertised. Solar wind speeds have jumped up to 750 km/s, and a crack is opening in Earth's magnetic field. A severe G4-class geomagnetic storm is underway. If it is dark where you are, be alert for auroras!
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