The sun sure has woken up this week, unleashing a powerful X-class solar flare on Jan. 18 that hurled a colossal, fast-moving coronal mass ejection (CME) directly toward Earth. That CME has now arrived, triggering severe (G4) geomagnetic storm conditions far earlier than initially forecast.

A solar radiation storm stronger than one we’ve seen in over two decades is in progress, the Space Weather Prediction Center announced Monday.

The largest solar radiation storm in more than 20 years hits Earth, according to the National Oceanic and Atmospheric Administration’s Space Weather Prediction Center. This will be the second-strongest level issued by NOAA for geomagnetic storms.

A powerful flare has unleashed a severe solar storm that could cause auroras and satellite disruptions on Earth.

Colorful auroras could dazzle skywatchers again on Monday night amid a severe geomagnetic storm and what the National Oceanic and Atmospheric Administration said was the largest solar radiation storm in more than 20 years.

The massive sunspot that sparked an "extreme" geomagnetic storm in May 2024 unleashed hundreds of other dangerous solar flares, including a hidden X-class outburst, a new paper reveals. The study sets a record for the longest continuous observation of a single active region on our home star.

The sun is not only our closest stellar neighbor, it's also the star we understand the most. As we've observed it over the centuries, we've learned that the sun is not an immortal constant. It goes through active and quiet cycles,

By tracing solar flare gamma rays, scientists gain new insight into particle behavior that shapes space weather forecasts.

Yesterday, sunspot 4341 unleashed an X-1.95 strength flare, accompanied by a large coronal mass ejection and so-called “flare ribbons”. Although far from record-breaking in power, the flare was unusually long-lasting and occurred over a vast area of the Sun.