AURORAS CAUGHT MAKING NOISE: For centuries, people inside the Arctic Circle have reported hearing strange hissing and popping sounds under the Northern Lights. Evidence is mounting that at least some those auroral sounds are real. On Oct. 7th, a researcher in southern Finland recorded some during a G1-class geomagnetic storm--the latest in a series of detections by the long-running Auroral Acoustics Project. Visit today's edition of Spaceweather.com to hear a sample "geomagnetic thunderclap."
Above: Green auroras over southern Finland on Oct. 7-8, 2018. During the display, microphones in the region recorded popping and clapping sounds, which one researcher has attributed to the action of the geomagnetic storm. Photo credit: Matti Helin.
