[_Jim]

That is, could Earth wobble a little on its axis as the two fields interacted?

Yes, it's all a matter of degrees ... having said that, it would take an awful lot of 'matter' hitting the magnetosphere and ionosphere to have an effect. We are more likely to see the earth's magnetic field change due to internal forces (in fact, it moves yearly, in fact, it moves daily) ...

North Magnetic Pole

Daily Movement of the North Magnetic Pole (Including diagram)

[pa_dweller]

in fact, it moves yearly, in fact, it moves daily

That I remember from Boy Scout days. Thanks.

[Barnacle]

Cool links. Thanks.