New solar-powered balloons allow researchers to study a presumed sound tunnel in the atmosphere.
. By then, Cold War tensions had settled and research in atmospheric acoustics had all but died out, says Stephen McNutt, a volcanic seismologist at the University of South Florida. “All of a sudden, the rug got pulled out, and infrasound wasn’t funded for 30 or 40 years,” he says.
Equipped with modern technology, she and her colleagues drove to an airport near Albuquerque and on 14 April 2021 launched a balloon at sunrise. They timed the flight to coincide with the launch of Blue Origin’s New Shepard rocket, which was taking off more than 400 kilometers away in Van Horn, Texas.
To make matters even more confusing, the team repeated the experiment with another rocket launch out of Vandenberg Air Force Base in California on 27 September 2021 and saw no signal at all. Although this new rocket launch was three times farther away than the one in Texas, they still expected the atmospheric SOFAR channel to carry the sound waves from the rocket to the balloon, Albert says.
Going forward, the researchers plan to listen to launches with multiple balloons staggered at different altitudes to figure out where the channel’s effects are strongest. They also plan to test the range of the signals and investigate the mysterious background noise.
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