Audio of the phenomenon known as “chorus,” radio waves within Earth’s magnetosphere that are audible to the human ear, as recorded on Sept. 5, 2012 by RBSP’s Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS). Five six-second 'events' are captured in this sample, and they are played end-to-end, one right after the other, without gaps.
Researchers from the Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) team at the University of Iowa have released a new recording of an intriguing and well-known phenomenon known as “chorus,” made on Sept. 5, 2012. The Waves tri-axial search coil magnetometer and receiver of EMFISIS captured several notable peak radio wave events in the magnetosphere that surrounds the Earth. The radio waves, which are at frequencies that are audible to the human ear, are emitted by the energetic particles in the Earth’s magnetosphere.