Get the latest tech news
"Frost crack" sounds may come from sky, not trees
An acoustic experiment reveals that spooky forest sounds may come from above.
For people living in northern climates, certain sounds that emerge in the cold of winter, ringing out like muffled rifle shots, have long seemed to emanate from the trees themselves. On a cold night last January, Laine recorded hundreds of sound events that resembled those often attributed to frost cracks and was able to localize them in the sky at around 246 feet above the Earth, under temperature inversion conditions. Njål Gulbrandsen, a space and plasma physics researcher at the Tromsø geophysical observatory in Norway believes that Laine’s work is groundbreaking, but needs further, more rigorous testing by other scientists.
Or read this on Hacker News
