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Figure 1: The Non-linear force-free field in the active region AR8151. The field was computed from observed vector magnetic field using Boundary Element Method (Yan and Sakurai, 2000). The vector field data was taken by HSP at Mees.
Figure 2. The linear force-free field in the active region AR8151. The field was computed from LOS magnetic field using Green Function Method (Chiu et al, 1977). The magnetic field was taken by HSP at Mees and the alpha is +0.025 pixel^-1.
Figure 3: The potential field in the active region AR8151. The boundary data used is LOS magnetic field taken at MEES.
