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You will think Moons will be silent compared to their host planet, but it’s not entirely true – if you know how to listen. The main investigator for Juno NASA’s mission, Scott Bolton, has produced an audio record of magnetic field activities around Jupiter’s Moon Ganymede when Juno’s spacecraft flew past 7 June 2021. Clip 50 seconds revealed sharp changes in activities as a probe entered the different parts of the magnetosphere of ganymede , maybe because leaving the night side to enter the daytime.
Audio comes from the shift of electrical and magnetic frequencies into a ranging range. Jupiter’s magnetosphere dominated that the months and attended the recording, but Ganymede was the only month in the solar system to have a magnetic field (possibly because of the liquid iron core). This is not an achievement that you can turn elsewhere in the near future.
The soundtrack is part of a larger Juno direction where the mission team reveals the most detailed map of the Jupiter magnetic field. The data shows how long it will take a large red point and a large blue spot of the equator to move around this planet (4.5 years and 350 years) respectively). This finding also shows that East-West Jetstream rips a large blue spot, and that the polar cyclone behaves like a sea vortis on earth.
You will not hear these voices if you can visit Ganymede themselves. However, they are reminders that even the world that seems to die is often filled with activities that you can detect using the right instruments. It’s just a question about how easy it is to pay attention to that activity.
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