Hi Cynthia,
Actually, all magnets have a north and south pole (a magnetic with just
one pole would be called a " "magnetic monopole" no one has ever
discovered one). The Earth, for instance, has both a north and south
magnetic pole.
As a simple picture you can think of a simple sunspot group as being
like a bar magnet with a north and south pole. It isn't really quite
that simple, but that is the basic idea.
cheers,
Terry