magnetic monster that socked Earth’s atmosphere on April 15. The result? A global rave in the sky. Experts at NOAA’s Space Weather Prediction Center had warned of a G3-level storm for April 16 ...

When an electric current passes through a metal wire, a magnetic field forms around that wire (see diagram at right). Likewise, a wire passing through a magnetic field creates an electric current ...

Arriving hours earlier than expected, a CME struck Earth's magnetic field at 1 p.m. ET (1700 GMT) on April 15, according to Spaceweather.com. A strong (G3) geomagnetic storm watch remains in place ...