As the northern lights lit up skies across the U.S., here's how agencies braced for potential disruptions to power grids and critical infrastructure.

Geomagnetic storms brought the northern lights to much of the U.S. this week, painting the sky in vibrant hues of green and pink. "Well, we had activity tonight — a lot of geomagnetic storm activity," Shawn Dahl,

The predicted speed of the third coronal mass ejection in the series was the highest he'd ever seen: about 870 miles per second. Conde said that although the best auroras were forecast for Tuesday and Wednesday, the lights could continue to shine for the next few days.

The strongest solar storm in over 20 years continues, and a major boost on Wednesday afternoon could elevate this aurora experience to once-in-a-lifetime.

The strong geomagnetic storm that produced some spectacular views of the northern lights, aka the aurora borealis, Tuesday night continues and may make them visible again tonight in the region.

Missed the northern lights this week or too cloudy near you? Check if the northern lights are visible tonight in New Jersey and other states.

Australia and New Zealand witnessed a spectacular aurora australis, a 'cannibal' solar storm causing vibrant pink, violet, and green lights. This G4 geomagnetic storm, one of the strongest, was caused by colliding solar energy bursts.

The earth is experiencing a G4 severe geomagnetic storm Wednesday, which means energy is being emitted from the surface of the sun and absorbed by the earth’s magnetosphere.