Hi Tiffany,
You’ve just asked a fascinating question. There are many
solar physicists who spend their entire career to answer this question. The
problem is still an active research area, and not completely understood.
Sunspots are regions on the Sun with very strong magnetic
fields. These strong magnetic fields are generated below the surface of the Sun
with some structures and are pushed upwards by certain forces. When these
structures emerge or going upwards, we see the sunspots grow. Once a sunspot completes
its emerging phase, its magnetic field begins to get weaker, and the sunspot
shrinks and eventually disappears when its magnetic field becomes too weak.
Now, why some sunspots come in clusters? Some of the strong magnetic field
structures are simple and some are really complicated, so that some sunspots
are simple dots and others come in clusters.
Well, actually if you would like
to become a solar physicist and work on this very question of your own, you
might even find better answers.
Yan