I just find this fascinating. I reached a point where I just assumed the whole thing was a hoax (albeit a well-executed hoax).
Here's what the film's website says about it: "In Magnetic Movie, Semiconductor have taken the magnificent scientific visualisations of the sun and solar winds conducted at the Space Sciences Laboratory and Semiconducted them. Ruth Jarman and Joe Gerhardt of Semiconductor were artists-in-residence at SSL. Combining their in-house lab culture experience with formidable artistic instincts in sound, animation and programming, they have created a magnetic magnum opus in nuce, a tour de force of a massive invisible force brought down to human scale, and a very most beautiful thing.'
"With Magnetic Movie, Semiconductor have tapped into a new and ancient aesthetic of turbulence. We can hear it in the sounds of natural radio-naturally-occurring electromagnetic signals from the earth's ionosphere and magnetosphere-that course through Magnetic Movie, at times animating the animation, a quick nervous response condensed into static. The sound itself is the product of the combined turbulences of the earth's molten core, weather systems and electrical storms, ephemeral ionization in the upper atmosphere, and the solar winds."
I read this to mean that the images are indeed fictional, but not necessarily wholly inaccurate.