This is absolutely fantastic, there's no two ways about it. NASA has launched two space probes into the Van Allen radiation belts to study "killer electrons." On those probes is the Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) receiver, a device that records the electromagnetic radiation and turns it into sound.
The video above goes into a bit more detail on the sound recording, but you really need to listen to the sound to be amazed. HAM radio operators have been able to hear the sound for years, however, what they hear isn't nearly as clear as what was just recorded on NASA's new probes.
"This is what the radiation belts would sound like to a human being if we had radio antennas for ears," said Craig Kletzing, a physics professor at the University of Iowa. You can listen to the sound from NASA's website. Right now, it is a 16-bit sampled recording in mono, however, there are plans to make a stereo recording.