In the linear foree-free field approach, the Chiu-Hilton method is superior to other methods used to extrapolate the magnetic Structure of solar active regions from the pho-tospheric normal magnetic field. However, in.

• 在根据日面法向磁场、以线性无力场模型推算活动区上空磁场的工作中；Chiu-Hilton方法是较好的一个.