Last weekend, a researcher in southern Finland recorded a 'geomagnetic thunderclap' during a geomagnetic storm.

Space Weather News for Oct. 10, 2018
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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 (http://spaceweather.com) to hear a sample "geomagnetic thunderclap."

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