Magnetic field strength as a function of distance from the central star (along a 45° line in the meridional plane) quantifying the expansion of the magnetic field for the baseline case. The lower solid line is the initial dipole field, the top solid line is the strength of the evolved total magnetic field at ﹩t=61.6﹩ days, and the middle solid line is the poloidal field at the same time. The dashed lines are broken power‐law fits to the data, and the power, n, in the exterior region of the fit is shown.