Northern lights occur when a solar flare interacts with Earth's atmosphere.

Space weather has seen a flurry of activity this week. An explosive solar flare that erupted Tuesday, just two days after the ...

Fired from a vast sunspot, the "coronal mass ejection" is expected to reach Earth on either Thursday or Friday this week.

A rapidly growing sunspot has fired off at least 18 M-class and three X-class flares in just 24 hours, including an intense ...

The Sun has released four powerful X-class solar flares in just two days, alarming scientists worldwide. Experts warn these ...

A solar storm of this strength could spark aurora visible to the naked eye as far south as parts of California, the central Plains and the Mid-Atlantic.

Forecasters at NOAA's Space Weather Prediction Center monitored a solar flare lasting for hours on Sunday. The Coronal Mass Ejection that came with it could produce aurora for northern states and ...

The planet is experiencing the most powerful solar event since 2003—and it's bringing spectacular Northern Lights.

Astronomers and satellite operators are on high alert. "More flares are in the offing," warn forecasters, as the sunspot's instability promises weekend fireworks.

Under the current forecast, the northern lights may be visible across much of the northern half of the United States, and even as far south as northern California. The only question is - will ...

The Sun unleashed powerful X-class solar flares from sunspot region AR 4366, tracked by NASA and the Solar Dynamics ...