‘Some of the audible features unfortunately are the result of onboard interference. The constant tone at 2.4kHz is caused by the spacecraft power supply. The occasional sound like someone pounding a bass drum is the result of spacecraft attitude thruster firings. The sound more like thumping on an oil barrel that tends to occur about 7 seconds into each frame, but sometimes more frequently at a regular cadence, is due to a stepper motor on another instrument. The tones with harmonics that build slowly and end abruptly and appear as multiple horizontal lines in the spectrogram are due to the grid modulation of another instrument. The rest of the signals are the naturally-occurring plasma waves that this Voyager instrument was designed to detect: These are the genuine “sounds of Jupiter”.’

‘[This] shows the likely geometry of the termination shock during the crossing on December 16, 2004. As the spacecraft approached the shock (indicated by the dashed lines), it encountered a magnetic field line that is tangent to a small ripple in the shock front. An electron beam escaping from the shock along the tangent magnetic field line caused the electron plasma oscillations shown in Figure 1. Shortly after that, on December 16, the spacecraft passed through the termination shock.’

University of Iowa, Space Audio

Featuring sounds from the first human recording to have left the solar system: the golden record “Murmurs of Earth” on the Voyager spacecraft…. and other effects of the exploration.