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Possibilities in principle for satisfactory removal of the 180-azimuthalambiguity in the transverse field of vector magnetograms and the extrapolationof magnetic fields independently of their position on the solar disk are shown.Revealed here is an exact correspondence between the estimated field and thenonpotential loop structure on the limb. The Metropolis's algorithm modified towork in spherical geometry is used to resolve the azimuthal ambiguity. Based ona version of the optimization method from Rudenko and Myshyakov (2009), we usecorrected magnetograms as boundary conditions for magnetic field extrapolationin the nonlinear force-free approximation.

Azimuth ambiguity removal and non-linear force-free extrapolation of near-limb magnetic regions