Chirps of alien birds?

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Posted: Dec 4, 2012 7:39 PM by Michael Marsh
Updated: Dec 4, 2012 7:39 PM
Source: Associated Press

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Topics: NASA, Van Allen Probes, radio waves

Two NASA spacecraft captured the clearest sound recordings yet from Earth's radiation belts and they're described by a scientist as the chirping of "alien birds". The Van Allen Probes are studying the radiation belts and collecting detailed measurements of high-energy particles and radio waves. These so-called chorus waves operate in the same frequency as human hearing. The high-pitched radio waves were played at a conference in San Francisco on Tuesday.

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