The Effects of Polarization Crosstalk and Solar Rotation on Measuring Full-Disk Solar Photospheric Vector Magnetic Fields
The Effects of Polarization Crosstalk and Solar Rotation on Measuring Full-Disk Solar Photospheric Vector Magnetic Fields
复制标题
偏振串扰和太阳自转对全盘太阳光球矢量磁场测量的影响
DOI：
10.1086/520056
复制
发表时间：
2007-09
期刊：
影响因子：
--
通讯作者：
中科院分区：
文献类型：
--
作者：
全盘太阳光球矢量磁场的观测对于研究太阳磁场的整体特性和演化具有重要意义。此类观测可以让我们以比局部区域观测更宽的视场 (FOV) 来研究活动区域和磁场非电势之间的磁连通性。为此，我们为怀柔太阳观测站太阳磁力与活动望远镜（SMAT）开发了全盘矢量磁图仪。在本文中，我们指出了影响全盘矢量磁场测量精度的两个问题：仪器产生的圆偏振串扰和太阳自转引起的波长偏移。人们尝试校正这种偏振串扰并从偏振数据重建全盘矢量磁场。我们还粗略地讨论了全盘太阳矢量磁场测量中Lyot滤波器的不完全宽视场（IWFOV）问题。此外，还将 SMAT 的偏振数据与进行局部观测的太阳磁场望远镜 (SMFT) 的偏振数据进行了比较。虽然SMFT的灵敏度是SMAT的2-3倍，但是两种仪器的偏振数据基本一致。
Observations of full-disk solar photospheric vector magnetic fields are very important for the studies of the global properties and evolution of solar magnetism. Such observations can allow us to investigate the magnetic connectivities between active regions and the nonpotentiality of magnetic fields with a much wider field of view (FOV) than do local-region observations. Therefore, we developed a full-disk vector magnetograph for the Solar Magnetism and Activity Telescope (SMAT) at Huairou Solar Observing Station. In this paper, we point out two problems that affect measurement accuracy of full-disk vector magnetic fields: circular-to-linear polarization crosstalk produced by the instrument, and wavelength shift due to solar rotation. An attempt is made to correct such polarization crosstalk and to reconstruct full-disk vector magnetic fields from polarization data. We also give a superficial discussion about the problem of an incompletely wide field of view (IWFOV) of the Lyot filter in the measurements of full-disk solar vector magnetic fields. In addition, the polarization data of the SMAT are compared with those of the Solar Magnetic Field Telescope (SMFT), which operates the local-region observations. Although the SMFT is 2-3 times as sensitive as the SMAT, there is a basic agreement on the polarization data of the two instruments.
登录
查看更多内容
DOI：
10.1117/12.138798
发表时间：
1992-12
期刊：
--
影响因子：
--
作者：
E. West;K. Balasubramaniam
通讯作者：
E. West;K. Balasubramaniam
影响因子：
2.8
作者：
E. West;M. Hagyard
通讯作者：
E. West;M. Hagyard
DOI：
10.1086/509062
发表时间：
2007
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Jing Li;T. Amari;Yuhong Fan
通讯作者：
Jing Li;T. Amari;Yuhong Fan
太阳磁力和 HSOS 的活动望远镜
DOI：
10.1088/1009-9271/7/2/12
发表时间：
2007-04
期刊：
Chinese Journal of Astronomy and Astrophysics
影响因子：
--
作者：
通讯作者：
--
DOI：
10.1086/170757
发表时间：
1991-12
期刊：
The Astrophysical Journal
影响因子：
--
作者：
K. Balasubramaniam;E. West
通讯作者：
K. Balasubramaniam;E. West