A ‘CANNIBAL CME’ IS APPROACHING EARTH: A strong G3-class geomagnetic storm is possible later this week when a ‘Cannibal CME’ hits Earth’s magnetic field. It’s a ‘cannibal’ because it ate one of its own kind en route to our planet. The mash-up of two CMEs could spark naked-eye auroras visible from northern-tier US states. Full story @ Spaceweather.com.

Aurora Alerts: Sign up for Space Weather Alerts and get instant text notifications when geomagnetic storms are underway.
 
Above: This frame from a NASA animation shows one CME overtaking another. The resulting merger is called a ‘Cannibal CME.’