NASA - National Aeronautics and Space Administration

Voyager 1's plasma wave instrument detected electrons in the solar wind oscillating back and forth near the termination shock. This graph depicts how the volume and pitch of the sound from the oscillations varied over a three-hour period from 18:00 to 21:00 Universal Time on Dec. 15, 2004. In the sound file, this interval has been compressed to six seconds.

The vertical axis on the left represents pitch from 0 to 500 hertz. The horizontal axis on the bottom represents the three-hour period.

Credit: NASA/JPL/University of Iowa

+ Transmission (video and audio combined)
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+ Java animation from University of Iowa
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Susan Watanabe
NASA Jet Propulsion Laboratory