Infrasound in the stratosphere recorded on the UNC Chapel Hill payload during the HASP 2014 flight.  Time series has been sped up 1000x.  Turn up volume for full effect.

Infrasound in the Stratosphere

Infrasound in the middle stratosphere recorded during the 2015 NASA High Altitude Student Platform (HASP) balloon flight.  Acoustic signals were bandpassed between 0.5 and 30 Hz, then sped up 500x to bring them into the infrasound range.  

Infrasound in the Stratosphere on the HASP 2015

The ocean microbarom recorded on the Carolina Infrasound payload during the 2016 NASA Ultra Long Duration Balloon mission.  Data were filtered between 60 seconds and 10 Hz, then sped up 4400x to bring it into the audio range.  The record covers one day starting at 00 UTC, May 25, 2016.  See https://blogs.nasa.gov/superpressureballoon/2016/06/07/high-flying-recording-studio-captures-deep-bass-infrasound/ for more information about the mission.

Ocean Microbarom in the Stratosphere

Far below the audio range lies the realm of geoacoustics: whispers from the Earth, sea, and sky. Here's twelve days' worth of sound compressed into a few minutes so we can hear it unaided. The whispering tones in the background is from the ocean microbarom, a sound generated when waves collide.  The other sounds are presently unidentified.  The track is built from data recorded on the Carolina Infrasound payload during the 2016 NASA Ultra Long Duration Balloon flight.

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