What Moggy describes about the electromagnetic interactions of the planets is essentially correct. The independent physicist James McCanney (www.jmccsci.com) described the electrical plasma characteristics of the solar system… something NASA still will not admit to. NASA says space is ‘neutral’ electrically… but it is NOT.
Solar periodicity, from what I have studied, appears related to the gravitational effects of the angular momentum of the planets as they orbit the sun. Being a ham radio operator, I’ve studied the 11-year solar cycle as it affects the ionosphere and shortwave radio propagation around the planet.