If you're up high, and you listen carefully on nights when the northern sky dances with blazing sheets of green light – Earth's spectacular aurora borealis – you might hear some ghostly sounds.
On particularly cold, clear, calm nights, a layer of warmer air forms above a shallow layer of cold air at the bottom of the atmosphere.
The new recordings were made in an attempt to investigate the phenomenon further. Near the village of Fiskars, the team set up their recording equipment to listen for popping, crackling sounds emanating from the atmosphere. "Using the geomagnetic data, which was measured independently, it's possible to predict when auroral sounds will happen in my recordings with 90 percent accuracy,"The work suggests that there is likely a causal link between the auroral sounds and geomagnetic activity, with different types of activity producing different sounds.
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