I saw the SuspiciousObserver talking about strong magnetic regions on the sun. I hope he will stop that soon.
See: https://www.youtube.com/watch?v=02wvcewUfno&t=23s
He was describing this solar flare:

And showed this image with the Zeeman/Stark effect. Stating it showed magnetic fields.

It is not the Zeeman effect (magnetic field) it is the Stark effect (electric field). It is similar.
I have to correct the mistake:
These regions are electric positive and electric negative charged regions.
That is why we see a current connecting them.
Dark Spots
The charge of the regions also explains why we see black spots.

These spots are black, because of the excess of electrons (or protons).
You can see how this works in this image:

Electrons create a dark reflective surface (like graphite).
Protons probably do the same thing.
So dark spots on the sun are likely to show up on places where the electric charge is very strong.
Magnetic unicorns
The mainstream thinks that they can predict solar flares with unicorns.

Now they added a twist to make these lines disconnect and reconnect.
No idea what can cause such a twist, but then I do not believe in unicorns in space.
Full list of images on imgur