system
Given the following post, respond as if you're commenting on Reddit:
human
If sunspots are caused by magnetic fields pointing out of the suns surface, then are there inverse sunspots that are brighter caused by the magnetic fields re-entering the star?

Also, are the poles of a star always a sun spot?
gpt
Actually, the magnetic lines do both enter & exit the sun, but it causes sun spots in both places. 

Magnetic field direction is arbitrary (we could have had a system that points from South to North, instead of from North to South). Charged particles (like protons & electrons) like to follow along magnetic field lines (both up & down them in a corkscrew around the field lines, but they go clockwise in one direction & counterclockwise in the other, depending on their charge & the magnetic field orientation). 

This wouldn't matter for a person (we're basically neutral in charge), but the sun is so hot that it rips the electrons off of the atoms, and then the atoms split into a plasma of charged ions (+) & electrons (-). If there are magnetic field lines going up/down, they (the ions & electrons) can only go up/down along them, and not really move out of the way sideways. This prevents convection, or mixing, which is usually going on in the sun.

So usually the sun is just churning, bringing hot plasma from the interior up, and pulling down colder plasma from the surface.

But when there are lots of field lines, the hot stuff in the middle has to go up straight to get out, and the cold stuff at the surface has to go down straight to get back inside, and they end up blocking each other like a bunch of cars trying to all go the opposite directions on a bunch of narrow streets, so hot interior gas coming up to the surface can't get up very efficiently. 

So a dark, relatively cool sun spot forms on the surface. It's still quite hot, but just not _as_ hot as the really hot stuff below would be if it could make its way up.