论文标题
使用端到端仪器模拟校准副磁图II：校准理论
Calibrating GONG Magnetograms with End-to-end Instrument Simulation II: Theory of Calibration
论文作者
论文摘要
这是使用其测量过程的端到端模拟对锣磁刻录进行“绝对”校准的三篇论文中的第二篇。在第一篇论文中，我们描述了其测量过程的锣工具和“端到端”模拟。在本文中，我们总体上考虑了校准理论和磁化图比较，从而确定了一些重要的问题和陷阱。磁力扫描的校准是其是否保留磁通量的函数，与空间分辨率无关。但是，我们发现最常用于磁力仪校准和比较的一维比较方法将显示两个具有不同空间分辨率的磁力图之间的巨大差异，即使它们都保留了通量。文献中发现的磁图之间的某些明显分歧很可能是由于这些仪器分辨率差异而不是任何内在校准差异的结果。为了避免它们，必须在比较磁图或制作校准曲线之前仔细匹配空间分辨率。在第三篇论文中，我们在此处使用的经验教训将使用我们的“端到端”测量模拟绝对校准。
This is the second of three papers describing an `absolute' calibration of the GONG magnetograph using an end-to-end simulation of its measurement process. In the first paper, we described the GONG instrument and our `end-to-end' simulation of its measurement process. In this paper, we consider the theory of calibration, and magnetograph comparison in general, identifying some of the significant issues and pitfalls. The calibration of a magnetograph is a function of whether or not it preserves flux, independent of its spatial resolution. However, we find that the one-dimensional comparison methods most often used for magnetograph calibration and comparison will show dramatic differences between two magnetograms with differing spatial resolution, even if they both preserve flux. Some of the apparent disagreement between magnetograms found in the literature are likely a result of these instrumental resolution differences rather than any intrinsic calibration differences. To avoid them, spatial resolution must be carefully matched prior to comparing magnetograms or making calibration curves. In the third paper, we apply the lessons learned here to absolute calibration of GONG using our `end-to-end' measurement simulation.
