Voyager 1's 'plasma wave instrument' detects electrons that are excited when solar storms interact with the ionized gas that surrounds it. They occur at frequencies up to a few thousand hertz, so it can be translated to audio via loudspeakers.
Voyager 1's 'plasma wave instrument' detects electrons that are excited when solar storms interact with the ionized gas that surrounds it. They occur at frequencies up to a few thousand hertz, so it can be translated to audio via loudspeakers.