Northern lights may be visible in much of the country this weekend after solar storm

The northern lights may be visible Saturday and Sunday in parts of the country where they're rarely seen.

The federally-funded AuroraMAX observatory in Yellowknife said in a post on social media that auroras may be visible across most of the country this weekend.

The only parts of the country not included in an "alert" issued by the observatory are the southernmost points in Ontario, southwestern Vancouver Island and southeastern parts of the Atlantic provinces, including all of Nova Scotia.

But the observatory, run through a partnership between the University of Calgary, the City of Yellowknife, the Canadian Space Agency and a local astronomy organization, says it is still possible that the lights may be visible in those parts of the country.

Eric Donovan, a professor at the University of Calgary's department of physics and astronomy who studies the aurora, said while he's always hesitant to make predictions, observations suggest a large magnetic storm may make the aurora more visible farther south than usual.

"There's a very good chance that tonight there will be very good aurora over large parts of Canada that don't see it often," he said, adding that the sky will have to be clear and other factors are at play.

"The aurora is driven by the solar wind, the solar wind is this gas of ionized particles that comes out of the sun all the time," he said in an interview Saturday. "What happens is that gas interacts with the Earth's magnetic field and that process extracts energy from the solar wind."

One of the effects of that process is the aurora.

"What people are predicting tonight, is that there will be a dramatic increase in the rate that energy is being delivered to this system. That means the solar wind is more dense, has more charged particles, and it's moving faster," he said.

That would make the aurora brighter, visible over a wider area and move it farther south, he said.

The Space Weather Prediction Center of the U.S. National Oceanic and Atmospheric Administration said in a release the solar storm is the result of a solar flare and the ejection of plasma and magnetic field from the sun, a phenomenon called a coronal mass ejection.