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'STEVE' descends on North America after surprise solar storm

The night sky light phenomenon called STEVE lights up a sky filled with stars over a lake.
This NASA composite image shows STEVE alongside the Milky Way over Childs Lake, Manitoba, Canada. (Image credit: Krista Trinder/NASA)

In the dark of Sunday night and Monday morning (Aug. 7 and 8), a surprise solar storm (opens in new tab) slammed into Earth, showering our planet in a rapid stream of charged particles from the sun

The resulting clash of solar and terrestrial particles in Earth's atmosphere caused stunning auroras to appear at much lower latitudes than usual — and, in southern Canada, triggered a surprise cameo from the mysterious sky phenomenon known as STEVE.

Alan Dyer, an astronomy writer and photographer based in southern Alberta, Canada, caught the wispy ribbons of green and violet light on camera as they shot through the sky.

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"STEVE lasted about 40 minutes, appearing as the … aurora to the north subsided," Dyer wrote on Twitter (opens in new tab) on Aug. 8. "STEVE was 'discovered' here so he likes appearing here more than anywhere else!"

Related: Earliest documented aurora found in ancient Chinese text (opens in new tab)

As Dyer noted, the strange sky glow called STEVE was first described by citizen scientists and aurora hunters in northern Canada in 2017. STEVE is typically composed of an enormous ribbon of purplish light, which can hang in the sky for an hour or more, accompanied by a "picket fence" of green light that usually disappears within a few minutes. 

The glowing river of light may look like an aurora, but it's actually a unique phenomenon that was considered "completely unknown (opens in new tab)" to science upon its discovery. Today, scientists have a slightly better idea of what's going on. 

STEVE (short for "strong thermal velocity enhancement") is a long, thin line of hot gas that slices through the sky for hundreds of miles. The hot air inside STEVE can blaze at more than 5,500 degrees Fahrenheit (3,000 degrees Celsius) and move roughly 500 times faster than the air on each side of it, satellite observations have shown.

Whereas the northern lights occur when charged solar particles bash into molecules in Earth's upper atmosphere, STEVE appears much lower in the sky, in a region called the subauroral zone. That likely means solar particles aren't directly responsible for STEVE (opens in new tab), Live Science previously reported. However, STEVE almost always appears during solar storms like Sunday's, showing up after the northern lights have already begun to fade.

One hypothesis (opens in new tab) suggests that STEVE is the result of a sudden burst of thermal and kinetic energy in the subauroral zone, somehow triggered by the clash of charged particles higher in the atmosphere during aurora-inducing solar storms. However, more research is needed to uncover the true secrets of STEVE. In the meantime, we can simply bask in its otherworldly glow and wave back at its twinkling green fingers.

Originally published on Live Science.

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Brandon Specktor
LiveScience senior writer

Brandon has been a senior writer at Live Science since 2017, and was formerly a staff writer and editor at Reader's Digest magazine. His writing has appeared in The Washington Post, CBS.com, the Richard Dawkins Foundation website and other outlets. He holds a bachelor's degree in creative writing from the University of Arizona, with minors in journalism and media arts. He enjoys writing most about space, geoscience and the mysteries of the universe.