A U.S. map shows electrical currents in the ground at about 4:40 p.m. ET Thursday, when a geomagnetic storm hit G4 levels. These currents can lead to damage to the electrical grid.

The powerful X1.3-class solar flare fired a coronal mass ejection (CME), a blast of the Sun's plasma and magnetic field, causing a large geomagnetic storm that resulted in a dazzling light show.

A powerful geomagnetic storm illuminated auroras that lit the skies over Earth on Thursday (Oct. 9) after X 2 solar flare that erupted from the sunspot AR 3848 on Tuesday (Oct. 8) evening.

Geomagnetic storm conditions observed over the weekend strengthened Monday morning, creating a “major disturbance in Earth’s magnetic field,” the Space Weather Prediction Center s… ...