We have an equatorial solenoid that factors in, as well. Arcing can occur without the secondary planet interaction, but there are definitely accounts of close approaches with other celestial bodies that triggered events. The aftermath of modern earthquakes reveal the same fractal patterns we associate with these electrical features. However, it's the scale differential that make me question whether the larger features that have shaped the planet could be done by our sun. Also, worth remembering, that the planets themselves affect the sun and how it behaves. Alignments are known to increase activity.
I also see sheer force behind shifting of continents, that I could only think to explain with additional bodies present to provide alternate points where a strong electromagnetic force could position itself to exert the force needed to redistribute our landmass in the manner we observe today. On top of a few other features, that correlate really nicely with things like say the planet Mars reigning down fireballs onto our Northern hemisphere, along with dichotomous features of the planet Mars itself, which again, all seem to support this idea of a polar configuration, which is already supported by symbols and legends.
I know you like the micronova theory, I'm just saying I'm not sold as it being a valid explanation to explain the many "mysteries" we observe in our celestial neighborhood.