aurora borealis tagged posts

A whitish, gray patch that sometimes appears in the night sky alongside the northern lights has been explained for the first time by researchers at the University of Calgary.

The article, which was published on Dec. 30 in the journal Nature Communications, explores a “structured continuum emission” that’s associated with aurora borealis.

“You’d see this dynamic green aurora, you’d see some of the red aurora in the background and, all of a sudden, you’d see this structured—almost like a patch—gray-toned or white toned-emission connected to the aurora,” says Dr. Emma Spanswick, Ph.D...

Tourists normally have to pay big money and brave cold climates for a chance to see an aurora, but last weekend many people around the world simply had to look up to see these colorful displays dance across the sky.

Usually banished to the poles of Earth, the auroras strayed as far as Mexico, southern Europe and South Africa on the evening of May 10, delighting skygazers and filling social media with images of exuberant pinks, greens and purples.

But for those charged with protecting Earth from powerful solar storms such as the one that caused the auroras, a threat lurks beneath the stunning colors.

“We need to understand that behind this beauty, there is danger,” Quentin Verspieren, the European Space Agency’s space safety program coordinator, told AFP.

Mike Bettwy of the...

Professor Emeritus Unto K. Laine of Aalto University has made recordings of auroral sounds, showing that the phenomenon is much more common than previously believed and occurs even in the absence of visible northern lights. “This cancels the argument that auroral sounds are extremely rare and that the aurora borealis should be exceptionally bright and lively,” Laine says.

Laine has been studying sounds associated with the northern lights for many years. In 2016, he published a paper linking recordings of crackling and popping sounds during an auroral event with temperature profiles measured by the Finnish Meteorological Institute (FMI)...

The spectacularly colorful aurora borealis — or northern lights — that fills the sky in high-latitude regions has fascinated people for thousands of years. Now, a team of scientists has resolved one of the final mysteries surrounding its origin.

Scientists know that electrons and other energized particles that emanate from the sun as part of the “solar wind” speed down Earth’s magnetic field lines and into the upper atmosphere, where they collide with oxygen and nitrogen molecules, kicking them into an excited state. These molecules then relax by emitting light, producing the beautiful green and red hues of the aurora.

What has not been well understood is precisely how group...