Giant solar balloons were sent 70,000 feet up in the air to record sounds of Earth’s stratosphere — and the microphones picked up some unexpected sounds
. The stratosphere is the second layer of Earth’s atmosphere, and its lower level contains the ozone layer that absorbs and scatters the sun’s ultraviolet radiation, according to NASA. The thin, dry air of the stratosphere is where jet aircraft and weather balloons reach their maximum altitude, and the relatively calm atmospheric layer is rarely disturbed by turbulence.
The inexpensive and easy DIY design means the researchers can release multiple balloons to collect as much data as possible. “Really, a group of high schoolers with access to the school gym could build a solar balloon, and there’s even a cellphone app called RedVox that can record infrasound,” Bowman said. Bowman estimated that he launched several dozen solar balloons to collect infrasound recordings between 2016 and April of this year.
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