It spans the sky like a mega-size wad of chewing gum stretched taut. It glows from within, pulses gently and sometimes releases tentacles of dripping, green ectoplasm.
It’s Steve, a mysterious space-weather emanation that’s expected to peak around the spring equinox on March 20.As far as anybody knows, Steve has been doing its groovy dance in the heavens forever. But it wasn’t until a group of Canadian photographers called the Alberta Aurora Chasers brought it to light in 2016 that it began to receive formal recognition. As is typical with many advances in science, this happened at a bar.
“I’d been watching that movie with my kids over the week prior, so it was in my mind,” says Chris Ratzlaff, a Calgary-area chaser who suggested the name. “Like watching the auroras dance, watching Steve pulse and move across the night sky is like magic and mesmerizing,” says Mitch Popilchak of the Alberta Aurora Chasers. He snared this shot of Steve in 2017 in Pincher Creek, Alberta:
“I can’t speak for places outside of Alberta, but I suppose there’s a certain amount of bragging rights for capturing a powerful Steve display in a beautiful setting,” says Clark Monson, who witnessed Steve near Mount Robson, British Columbia: Steve can last for minutes or upward of an hour, and during that time manifests queer optics. “Light at essentially all wavelengths in the optical band is enhanced where Steve is,” Donovan says.While Steve often accompanies auroras, it is not one. Some scientists believe Steve is the result of narrow, extremely fast-moving rivers of ions colliding with neutrally charged particles in the atmosphere.
“But I do not think we know all of the complex reasons why this occurs,” she says. “Specifically, it’s not just the reasons why the aurora also has seasonal peaks.”“It is extremely rare to connect a specific auroral feature to its drivers far away in space in the magnetosphere, and Steve presents unusual opportunities to do so,” she says. “In six more months, there will be quite a bit more new results on this, I believe.
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