suns magnetic polarity

The results also provide a clue to understanding how the Sun reverses polarity after every cycle.

Professor Chapman adds that "I also think it is remarkable that something the size of the sun can flip its magnetic field every 11 years, and going down-up is different to going up-down. Somehow the sun 'knows which way up it is', and this is an intriguing problem, at the heart of how the sun generates its magnetic field."
that could use some fleshing out
I bet it's related to this effect:

I bet it's related to this effect:

That's the intermediate axis theorem at work.

The Sun seems to rotate mostly about its polar axis, albeit at different rates at different latitudes (on the surface, at least). Of course, there's a lot of motion going on inside, as well.

Also worth noting, I think, that the Earth is similarly spherical and rotating about its polar axis. Although the Earth's magnetic field flips every 100,000 years or so, the entire rotation of the Earth does not flip when that happens.