> "is our Sun being electrically excited by the current of the Spiral arm?
Within the EU theory, I think you are correct here.
Wal Thornhill says:
"Near the Sun, galactic transmission lines are in the form of 35 kiloparsecs wide rotating Birkeland filaments. Their motion relative to the Sun will produce a slowly varying magnetic field and current density – in other words a solar activity cycle. To that extent, all stars are variable. And just like real estate, location is vital."
I think this also includes the sunspot cycle ie "transmission lines" - filaments within filaments?
Don Scott asks:
"What is the exact circuit diagram? - Precisely what paths do the galactic currents take in the vicinity of the Sun?"
"We know that currents and/or time varying electric fields are necessary to produce the Sun's strange and changing magnetic fields. Magnetic fields cannot exist without them. Are the magnetic field reversals observed on the Sun due to reversals (or changes of some sort) in the galactic currents or E-fields through which the Sun is traveling? Or is the Sun simply traversing slightly different magnitude current streams? (Are we making "lane changes" on the super highway of galactic electric current flow?)"
Perhaps we may know the answers to these questions soon enough.
I am not too sure as to whether the Gould Belt has any major influence in the sun's activity, at least in the short term.
In the long term, maybe.