The same solar region that brought an outburst of night-time beauty in early May is coming back around. But things have changed, a space weather expert tells NPR.
Scientists have updated their forecast for the current solar cycle, which usually lasts about 11 years. Solar activity is now expected to peak earlier and to be stronger than previously thought.
This week's geomagnetic storm will bring the aurora borealis further south. The Space Weather Prediction Center says the best time to view the aurora borealis is between 10 p.m. and 2 a.m. local time.
An article suggests the natural light show starts when disturbances on the sun pull on Earth's magnetic field, creating cosmic waves that launch electrons into the atmosphere to form the aurora.
If you weren't far enough in the north — or well-rested enough – to see the show, don't worry: stunning images were posted to Twitter and elsewhere. Here's a selection.