Spinning bodies, multiple moments of inertia and nested spheres with fluid drag coupling

The next videos make the case that the solar system’s excursion through the galactic plane is responsible for solar micro-nova eruptions,  magnetic pole reversal and physical pole shift.    But the period of this oscillation is 26 million years (https://public.nrao.edu/ask/what-causes-the-suns-periodic-vertical-oscillation-through-the-plane-of-the-galaxy/) which seems to contradict the geologic time scales needed, at least for the latter two.   The above video allows for a different solution: the rotational axis and uniformity of rotation of the core about that axis (which the magnetic poles track) seem to indicate that the rotation of the mantle and/or crust (with their asymmetric mass distribution) is probably imposing off-axis torque on the core, changing its rotational  orientation and increasing the turbulence of its molten flows, accounting for magnetic pole movement and intensity.   Some variation on the intermediate axis theorem could come into play due to this asymmetry and its effects on the rotation of the nested shells.   Just a thought.

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