Hello everybody. After reading about solar variability in the past I have found that the eleven year cycle of solar activity doen't affect the magnetic field of the sun so it is impossible to know the distribution of sunspots previous to 1610, when the observation started. But on the other hand, the proxies of 14C and 10Be can be used to calculate the long term variability of the sun. I don't understand the reason of the lack of effect of the 11 year cycle on the solar magnetic field. I have read that is related to the fact that this cycle only affect to closed field lines and they compensate between each other, but I don't understand much else. Can somebody please point me to some source where this is clearly explained? Thanks for reading.