As compared to the galaxy magnetic field inducing change on the Earth's?

The entire thing is ridiculous.

Oh, and that 12k year "geological cycle" (AKA random fluctuations that somebody got famous for mischaracterizing) is the weakest one without any visible consequences. The larger ones are much more interesting.

> that 12k year "geological cycle"

It's worse than that. The 12,000 years comes from "the duration of a full reversal" being "between 2,000 and 12,000 years" [1]. They took the duration of a phenomenon and mistook it for its frequency.

[1] https://en.wikipedia.org/wiki/Geomagnetic_reversal#History

That's equally ludicrous, yes. I didn't read beyond those two.

Yeah, I don't really buy it either as the evidence is weak. The author does provide some references to some astronomers and physicists hypothesizing about past "immense solar outbursts" from the Sun, orders of magnitude more powerful than modern events but no specific observations or data are cited.

There is also some discussion of "recurrent novae," faint and fast "dwarf novae," and simulations of triggering mechanisms that could produce nova-level energy releases from stars interacting with phenomena like interstellar dust clouds but I'm not sure if the scales of any of those match what the ancient peoples described or if the simulations results are even plausible.

Still an interesting theory imo.

Not quite the same thing, but Miyake events [1] are along the same lines; well-documented historical records of planet-wide radiation spikes that make the Carrington Event look like a walk in the park by comparison.

1. https://www.scientificamerican.com/article/mystery-of-ancien...

Are you sure you didn't read something from one of those Electric Sun cranks?