The Sun's Magnetic Field Flips Every 11 Years

We don't know why the sun's magnetic field flips every 11 years. It could be due to differential rotation, like the sun rotates but it doesn't rotate the same speed all over. The plasma currents inside the sun that are generating these magnetic fields might be moving sort of like in a huge donut of plasma. We have lots of very different weird ideas about what's going on inside the sun. And the problem is we just haven't gotten close enough to make the measurements we need to understand what’s going on.