SMFT/HSOS纵向磁图磁饱和自动检测与校正算法
Automatic Detection and Correction Algorithms for Magnetic Saturation in the SMFT/HSOS longitudinal Magnetograms
摘要：
在单波长点测量时，采用线性标定，在强磁场区，纵向磁场往往会出现饱和效应。在本研究中，我们发展了一种方法，可以判断由太阳磁场望远镜（SMFT）观测到的斯托克斯$V/I$的饱和阈值，并自动对其进行校正。其过程是先对Stokes $V/I$ \textit{vs} $I/I_{m}$（$I_{m}$是Stokes $I$的最大值）曲线进行二阶多项式拟合以估计饱和阈值，然后在强场区重建Stokes $V/I$以校正饱和。通过与日震磁像仪（HMI）磁像图的对比，证明了该算法的有效性。在175个活性区中，对饱和度的检测和校正准确率分别为$\sim$ 99.4%和$\sim$ 88%。讨论了该算法的优缺点。
英文摘要：
longitudinal magnetic field often suffers the saturation effect in strong magnetic field region when the measurement performs in a single-wavelength point and linear calibration is adopted. In this study, we develop a method that can judge the threshold of saturation in Stokes $V/I$ observed by the Solar Magnetic Field Telescope (SMFT) and correct for it automatically. The procedure is that first perform the second-order polynomial fit to the Stokes $V/I$ \textit{vs} $I/I_{m}$ ($I_{m}$ is the maximum value of Stokes $I$) curve to estimate the threshold of saturation, then reconstruct Stokes $V/I$ in strong field region to correct for saturation. The algorithm is proved to be effective by comparing with the magnetograms obtained by the Helioseismic and Magnetic Imager (HMI). The accurate rate of detection and correction for saturation is $\sim$99.4\% and $\sim$88\% respectively among 175 active regions. The advantages and disadvantages of the algorithm are discussed.
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