According to what we know so far, if the motion of planets is affecting solar variability as the myriad correlations which have been discovered suggest they are, then it must be via one or a combination of the known forces: Gravitation, Tides, Electromagnetism.
Because our knowledge is so incomplete, the safe way to proceed is to not rule out any of these possibilities, but to investigate, compare observations, make some logical deductions and inferences, and draw up some tentative hypotheses.
Since it is topical, I’ll concentrate on Jupiter and Saturn in this post. In an earlier post, and in Nicola Scafetta’s paper currently under discussion, it has been shown that the periods around the solar cycle length apparent in spectral analysis of the sunspot record closely match periods related to these gas giants. This makes immediate sense, they are the two biggest planets in the solar system. But…
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