Mysterious low-frequency sounds have been recorded by solar-powered balloons floating in the stratosphere
The data they collected showed that the stratosphere sounds quite different than the surface of Earth. On the ground, infrasound sensors pick up signals that have been deflected by winds on their way down, but the balloons floated above those winds – they recorded signatures of turbulence in other parts of the atmosphere, and infrasonic sounds of marine storms. However, Bowman says that many infrasound signals from the stratosphere didn’t have an obvious origin.
These mysterious signals could be related to types of atmospheric turbulence that have never been recorded before, but infrasounds in the stratosphere have only rarely been explored before so it is hard to make educated guesses, says Bowman.Darielle Dexheimer/Sandia National Laboratories He says one of the first balloon studies of this kind was a US Army Air Forces experiment code-named Project Mogul, which sought to detect infrasound signals of nuclear weapons tests in the Soviet Union in the 1940s. One of Project Mogul’s balloons crashed in Roswell, New Mexico, which brought the top secret programme into the public eye. The cover-up to conceal the balloon’s purpose sparked
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