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Space Audio

Van Allen A: Springtime Chorus 2014-03-02

1,030 views 4 months ago
These signals were recorded by the Van Allen Probes A spacecraft EMFISIS Waves instrument on 2014-03-02 during hour 06 UTC. The measurements of three orthogonal magnetic antennas Bu, Bv, and Bw were combined to make this 48-second stereo audio recording.

The video presents a frequency-time spectrogram for the three antennas, with a moving cursor that shows the time position of the audio track. Time advances from left to right along the horizontal axis, frequency ranges from low to high frequencies along the vertical axes, and the amplitude of the signals is color coded with blue indicating weak signals and red indicating strong signals.

Spring has arrived in the Northern Hemisphere and songbirds are returning. This recording may sound like the song of some strange species of bird, but it is actually a rare falling-frequency variation on chorus emissions which are associated with non-linear processes that may be responsible for transferring energy to trapped electrons in the Van Allen radiation belts and accelerating them to dangerous velocities.

For more Van Allen Probes EMFISIS Waves audio, see
http://www-pw.physics.uiowa...

For more "space audio" from various sources, see
http://youtube.com/VoyagerPWS Show less
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Donald A. Gurnett Play

Videos featuring or produced by Donald A. Gurnett, the James A. Van Allen and Roy J. Carver Professor of Physics at The University of Iowa.

Background for space audio Play

A few YouTube videos related to what we do. PR is not our specialty: space physics is, especially low-frequency radio and plasma waves.

http://www-pw.physics.uiowa.edu/
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