What is the impact of the current polar migration on the strength of Coriolis force
At the poles -- especially with respect to the consequent 'shearing' off the
Upper atmosphere(s) and consequent thinning of resistance to solar penetration
And ionization of the levels ?

Do you mean the migration of the magnetic field?

I thought that the coriolis force was non-existant at the poles.
And that the coriolis force was caused by the rotation of the earth - nothing to do with the magnetic field.

Ions may be able to pass more closely to earth during reversal, but I don't think that anybody is convinced whether the poles are migrating or not.

Could you please define your question a little better? :)