The squeaky soundbytes heard in the audio clip represent electric and magnetic radio waves emitted by Ganymede, Jupiter's largest moon.
A screenshot of a NASA video that features an audio clip of Juno's Ganymede flyby. Electric and radio data from the Jovian moon's magnetosphere was collected by Juno's Waves instrument. Juno's team then converted the frequency data into audio waves, and the radio waves are also represented visually here. Ganymede
, according to a NASA statement describing the newly published data. The Juno spacecraft performed a close flyby of the Jovian moon on June 7, during which time the Waves instrument collected the raw frequency data that Juno's team later shifted into the audio range. "If you listen closely, you can hear the abrupt change to higher frequencies around the midpoint of the recording, which represents entry into a different region in Ganymede's magnetosphere," Bolton said.
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