greetings,
I'll also add that the strength of the magnetic field in a sunspot can be slightly different depending on where in the sunspot you look, how high above the "surface" ( or how deep and close to the surface ), and other characteristics of the sunspot itself such as how big it is. The magnetic field strength in sunspots decreases as you look up in the atmosphere, in general. Also, the larger a sunspot is the stronger the magnetic field is, -- although this is a much more difficult observation than it sounds like it should be. Sunspots which are small have field strengths of about 1,500Gauss or roughly 1000 times, what we have on Earth. The largest sunspots have field strengths over 3500 Gauss. There is some debate as to whether sunspot field strengths can get significantly higher than this value.