About the periodic variation of the stellar magnetic fields

In this work, a general description of the observed variability of magnetic fields in stars of various spectral types is presented. Average magnetic phase curves (MPC) and their parameters are presented in three catalogs. As a result, there are currently medium magnetic phase curves for 415 stars, 258 of which are Ap/Bp stars. Such a large number of Ap/Bp stars allows you to judge not only the parameters variability, the structure of the global magnetic field, but also opens up the possibility of finding the reason explaining the super slow rotation of some of them.