coondoggie writes "NASA today said a strong-to-severe geomagnetic storm is in progress following a massive solar flare and coronal mass ejection (CME). CMEs are a solar phenomenon that can send solar particles into space and affect electronic systems in satellites and on Earth. Simulations indicate that solar wind plasma has penetrated close to geosynchronous orbit starting at 9am today. Geosynchronous satellites could therefore be directly exposed to solar wind plasma and magnetic fields. High-latitude sky watchers should be alert for auroras after nightfall, NASA stated."