"Earth's Chorus" captured by NASA's RBSP spacecraft [VIDEO]
The 'chorus' phenomenon is well known by scientists, which is a cluster of brief, rising-frequency tones that sound like the chorus of birds singing at sunrise. Energetic particles in the magnetosphere emit radio waves that are audible to humans. Recently launched NASA Radiation Belt Storm Probes mission's (RBSP) instrumentation captured an instance of the event.
More similar audio files are available at astrosurf.
Featured image: NASA/Jacob Bortnik