The solar interior is separated into four regions by the different processes that occur there.
Energy is generated in the core.
The thin interface layer between the radiative zone and the convection zone is where the Sun's magnetic field is thought to be generated. The Sun's core is the central region where nuclear reactions consume hydrogen to form helium. These reactions release the energy that ultimately leaves the surface as visible light. These reactions are highly sensitive to temperature and density. The individual hydrogen nuclei must collide with enough energy to give a reasonable probability of overcoming the repulsive electrical force between these two positively charged particles.