Van Allen Probes EMFISIS Waves
Party Chorus 2014-08-29

August 30, 2014, marks the 2nd anniversary of the launch of the twin Van Allen Probes spacecraft. To accompany the birthday candles, here's an extended cut of similar chorus signals . . . A veritable party!

Happy birthday to the Van Allen Probes! We're looking forward to even more exciting new discoveries!

These signals were recorded by the Van Allen Probes A spacecraft EMFISIS Waves instrument on 2014-08-29 between the hours of 05:00 and 06:00 UTC. The measurements of three orthogonal magnetic antennas Bu, Bv, and Bw were combined to make the 3 minute 47 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.