Earth chorus observed by Injun 3

Описание: The University of Iowa spacecraft, Injun 3, recorded these chorus emissions after it was launched in 1962.

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.

The video shows a spectrogram with time along the horizontal axis, frequency on the vertical axis, and color-coded amplitude with weak signals blue and strong signals red. A moving cursor shows the time of the corresponding audio.

For more information on the Injun 3 spacecraft:
http://nssdc.gsfc.nasa.gov/nmc/spacec...

This is a sample from the collection of Prof Don Gurnett's favorite space audio recordings available from:
http://space-audio.org/

For similar videos:
   / voyagerpws