NASA spacecraft records 'Earthsong'Quicklink submitted by Kyle McDermott Permalink
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|A NASA spacecraft has just beamed back a beautiful song sung by our own planet.Chorus is an electromagnetic phenomenon caused by plasma waves in Earth's radiation belts. For years, ham radio operators on Earth have been listening to them from afar. Now, NASA's twin Radiation Belt Storm Probes are traveling through the region of space where chorus actually comes from - and the recordings are out of this world. "This is what the radiation belts would sound like to a human being if we had radio antennas for ears," says Kletzing, whose team built the "EMFISIS" (Electric and Magnetic Field Instrument Suite and Integrated Science) receiver used to pick up the signals. He's careful to point out that these are not acoustic waves of the kind that travel through the air of our planet. Chorus is made of radio waves that oscillate at acoustic frequencies, between 0 and 10 kHz.|
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