There are a variety of interesting topics concerning the magnetocnvection in sunspots. You can find below examples of some of the papers we have published about sunspots.
Rezaei, Schlichenmaier, Beck, Bellot Rubio, A&A 454, 975 (2006)
Rezaei, Beck, Schmidt, A&A 541, A60 (2012)
Kiess, Rezaei, Schmidt, A&A 565, A52 (2014)