Why does the skin effect not alternate between the skin and core?

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dunc2027

Joined Jul 13, 2020
1
I think I understand the directions indicated in the diagram below, but only in the case of main current I increasing. Say that I is a sine wave, and the time is between π/2 and π. This means I is still positive but is now decreasing, with magnetic field H doing the same. Wouldn't this cause the direction of eddy current Iw to swap, causing current to be biased toward the core, not the skin?


Skin_effect.png

Isn't this the transition between states (b) and (c) for the below description of Lenz's Law?

Lenz_law_demonstration _crop.png

Or is there something very basic I have confused here?
 
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