here is an excerpt of the "Electric Sun" model


"...In the Electric Sun model, as with any plasma discharge, tufting disappears wherever the flux of incoming electrons impinging onto a given area of the Sun's surface is not sufficiently strong to require the shielding produced by the plasma double layer.
At any such location, the anode tufting collapses and we can see down to the actual anode surface of the Sun.
Since there is no arc discharge occurring in these locations, they appear darker than the surrounding area and are termed "sunspots".
Of course, if a tremendous amount of energy were being produced in the Sun's interior, the spot should be brighter and hotter than the surrounding photosphere.
The fact that sunspots are dark and cool strongly supports the contention that very little, if anything, is going on in the Sun's interior.
The center of the spot is called its umbra...."


Simple and straightforward as good theory should be.