An audio of the phenomenon known as “chorus” radio waves within Earth’s magnetosphere that are audible to the human ear, was recorded by RBSP’s Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS). Visualization built by Greg Shirah and Tom Bridgman, NASA/Goddard Space Flight Center Scientific Visualization Studio. Caption by Mike Carlowicz -Watch the video after the jump
This recording was made on Sept. 5, 2012, by many members of the EMFISIS (Electric and Magnetic Field Instrument Suite and Integrated Science) team, including Terry Averkamp, Dan Crawford, Larry Granroth, George Hospodarsky, Bill Kurth, Jerry Needell and Chris Piker.
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.
“People have known about chorus for decades,” says EMFISIS principal investigator Craig Kletzing, of the University of Iowa. “Radio receivers are used to pick it up, and it sounds a lot like birds chirping. It was often more easily picked up in the mornings, which along with the chirping sound is why it’s sometimes referred to as ‘dawn chorus.’”