For more info about the electromagnetic chorus phenomena visit: http://www.captaincynic.com/thread/94889/sounds-of-space-chorus-radio-waves-within-earth-s-magnetosphere.htm
The audio 'Chorus' in this video was recorded on Sept. 5, 2012, by RBSP's Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS).
Audio Credit: University of Iowa
Visualisation Credit: NASA/Goddard Space Flight Center
Video Compilation Credit: Captain Cynic Science Forums
