The sun make light with electric arc
The sun was born, is and will be perpetual, a glowing lightning.
The centripetal interaction of the sun (gravity) produces radial electric potential.
The electrical discharge produced by this potential is the solar activity.
The potential fills the sphere with electric discharge and implicitly with the plasma state.
So the sun's activity, are endless and violents electric discharge
The magnetic fields generated by large currents interact and produce protuberances.