Photographers flocked to dark vantage points well away from the city lights to capture images of one of the most spectacular auroras seen in Northern Ireland in years.
The magnificent Northern Lights display was all the better for being unexpected.
Even though a violent X-class solar flare shot a huge cloud of charged particles from the sun into space a few days ago, the cloud was expected to speed right past the Earth, or at least hit a glancing blow.
But according to storm-chaser Martin McKenna, the CME (coronal mass ejection) came racing through space at 2,000km per second, "whacked the magnetic field" and generated a major geomagnetic storm.
"I'd been out storm-chasing all day, but as soon as I got home the charts were going crazy. I had no dinner, no water, no anything – I was immediately back out again, fuelled by adrenaline," he said. Martin headed to Beaghmore stone circles in the Sperrins and then Lough Fea, capturing some incredible images.
"The sky turned blood-red to the naked eye and vivid orange, with huge green beams punctuating through the red," he said.
"It was unbelievable – the best aurora in over a decade."
Photographer Martina Gardiner was one of the aurora-chasing crowds who flocked to the north coast a few weeks ago only to be disappointed.
"I'm very into night-time photography and the aurora is the most wonderful thing. If you get a good night and an aurora, it's heaven for a night-time photographer," she said.
She went to the north coast and spotted the first signs on the road out of Coleraine as she headed for Dunluce Castle.
"I could see a band of light right over the sky and I knew it was going to be amazing," she said. "I saw pillars, shafts of light going up into the sky. I could see pink funnels going up."
Meanwhile, it was photographer Joe Kennedy's first time capturing the aurora as he staked out Portstewart Strand, and he said he would definitely be out again.