莱曼α太阳望远镜（LST）的平场空中定标方法
Methodology for In-flight Flat-field Calibration of the Lyman-alpha Solar Telescope (LST)
摘要：
平场反映了仪器焦平面处光度响应的不均匀性，该仪器使用数字图像传感器，例如电荷耦合器件（CCD）和互补金属氧化物半导体（CMOS）。在用于科学研究之前，必须纠正这种不均匀性。在本文中，我们评估各种候选方法，通过模拟使用现有的数据，以数字的莱曼阿尔法太阳望远镜（LST）的飞行中平场校准方法。LST是高级天基太阳观测站任务的有效载荷之一，由三个仪器组成：白光太阳望远镜、日盘成像仪和双波段日冕成像仪。在我们的模拟中，使用的数据从日震和磁成像仪（HMI）和大气成像组件（AIA）机载太阳动力学观测站（SDO）的任务。我们的研究结果表明，正常的KLL方法是适当的WST的飞行中平场校准和实现一个透射式扩散适用于SCI。对于SDI的空中平场标定，我们推荐采用离焦分辨率为18”左右的离点图像的KLL方法，并采用局部相关跟踪（LCT）算法代替边缘拟合来确定不同图像之间的相对位移。
英文摘要：
Flat-field reflects the non-uniformity of the photometric response at the focal plane of an instrument, which uses digital image sensors, such as Charge Coupled Device (CCD) and Complementary Metal-Oxide-Semiconductor (CMOS). This non-uniformity must corrected before being used for scientific research. In this paper, we assess various candidate methods via simulation using available data so as to figure the in-flight flat-field calibration methodology for the Lyman-alpha Solar Telescope (LST). LST is one of the payloads for the Advanced Space-based Solar Observatory (ASO-S) mission and consists of three instruments: a White-light Solar Telescope (WST), a Solar Disk Imager (SDI) and a dual-waveband Solar Corona Imager (SCI). In our simulations, data from the Helioseismic and Magnetic Imager (HMI) and Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO) mission are used. Our results show that the normal KLL method is appropriate for in-flight flat-field calibration of WST and implementing a transmissive diffuser is applicable for SCI. For the in-flight flat-field calibration of SDI, we recommend the KLL method with off-pointing images with defocused resolution of around 18", and use the local correlation tracking (LCT) algorithm instead of limb-fitting to determine the relative dis-placements between different images.
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