Earth Chorus


Spectrogram of Earth chorus
Click to play audio Click to play audio.
Earth Chorus
Earth Chorus

Chorus waves in Earth's magnetosphere are generated in the Van Allen radiation belts by electrons spiraling along Earth's magnetic field lines in this region. Once generated, the chorus waves interact with the moving electrons, disturbing the spiral orbit of the electrons and causing them to fall into Earth's upper atmosphere along the magnetic field lines.

Chorus waves consist of a rapid succession of intense ascending tones, rising in frequency over very short time intervals, each tone lasting typically less than one second. The frequencies of these rising tones occur in the audio frequency range and sound like a dawn chorus of chirping birds, a sound which gives these waves their name.

This example is from the University of Iowa Injun 3 spacecraft.



Return to "Favorite Sounds" page

Return to "Space Audio" page


© The University of Iowa 2003-2018. All rights reserved. Audio clips freely licensed.
Contact information. Send questions or comments to the site custodian.
The Radio and Plasma Wave Group, Department of Physics & Astronomy, College of Liberal Arts & Sciences.
  Valid HTML 4.01!