Polarization calibration of the Solar Optical Telescope onboard Hinode
Polarization calibration of the Solar Optical Telescope onboard Hinode
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DOI：
10.1007/s11207-008-9169-9
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发表时间：
2008-06-01
期刊：
影响因子：
2.8
通讯作者：
Cruz, T.
中科院分区：
文献类型：
--
作者：
Ichimoto, K.;Lites, B.;Cruz, T.
日月号上的太阳光学望远镜(SOT)旨在通过对太阳光谱线进行精确的光谱偏振测量来获得太阳上的矢量磁场，空间分辨率为0.2-0.3角秒。获得了10(-3)的测光精度，并且在偏振校准后，由于斯托克斯参数之间的串扰而产生的任何人工偏振都需要被抑制在SOT视场上的统计噪声水平以下。这一目标是通过高度优化的SOT偏振器设计、对光学元件的广泛分析和测试以及对整个系统的端到端校准测试来实现的。在本文中，我们回顾了实现SOT高精度偏振仪的方法及其最终的偏振特性。
The Solar Optical Telescope (SOT) onboard Hinode aims to obtain vector magnetic fields on the Sun through precise spectropolarimetry of solar spectral lines with a spatial resolution of 0.2-0.3 arcsec. A photometric accuracy of 10(-3) is achieved and, after the polarization calibration, any artificial polarization from crosstalk among Stokes parameters is required to be suppressed below the level of the statistical noise over the SOT's field of view. This goal was achieved by the highly optimized design of the SOT as a polarimeter, extensive analyses and testing of optical elements, and an end-to-end calibration test of the entire system. In this paper we review both the approach adopted to realize the high-precision polarimeter of the SOT and its final polarization characteristics.