"A whole bunch of synths and/or samplers, stereo panned and processed with a whole stack of effects, using a sped-up recording of Earth's magnetic field as a trigger of said generators".
This is not even remotely the sound of Earth's magnetic field.
(Generously assuming you're not just sh*tting on them for no reason.)
Even if you are not familiar with these methods, just think about it: even if soumeone would genuinely just bring the inaudible frequencies of a recording of magnetosphic waves into audible domain by speeding it up, without any processing, where would this lush stereo imaging come from? It would be plain and simply monophonic.
Moreover, they don't quite make it secret that this is not the actual sound of the magnetosphere:
>Musician and project supporter Klaus Nielsen, from the Technical University of Denmark, explains, “The team used data from ESA’s Swarm satellites, as well as other sources, and used these magnetic signals to manipulate and control a sonic representation of the core field.
https://www.youtube.com/watch?v=llXu9pSvF54
I do realize though, that many people won't hear any difference.