Journal ArticleDOI
Polarimeter with two ferroelectric liquid-crystal modulators attached to the Yunnan solar tower.
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TLDR
A polarimeter to be mounted on the Yunnan solar tower is described, which features the ability to simultaneously measure the magnetic fields of the solar photosphere and chromosphere by analyzing the Stokes spectra of those magnetosensitive lines forming in the two regions with very high efficiency of polarization measurement.Abstract:
A polarimeter to be mounted on the Yunnan solar tower is described. It features the ability to simultaneously measure the magnetic fields of the solar photosphere and chromosphere by analyzing the Stokes spectra of those magnetosensitive lines forming in the two regions with very high efficiency of polarization measurement. The polarimeter consists of two ferroelectric liquid crystals and one lambda/4 wave plate before a polarizing beam splitter. The achromatism of the design is emphasized to get the maximum combination efficiency over a spectral range from 5000 to 6000 angstrom. For the used solar absorption lines MgI517.27, FeI525.06, FeI630.15, and FeI630.25 nm, the design gives theoretical efficiencies of polarization measurements, which are 0.999, 1.0, 0.943, and 0.943, respectively. A comparison with other reference polarimeters, such as the Synoptic Optical Long-term Investigation of the Sun, the Tenerife infrared polarimeter, and the La Palma Stokes Polarimeter, is carried out. (c) 2006 Optical Society of America.read more
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Journal ArticleDOI
New vacuum solar telescope and observations with high resolution
Zhong Liu,Jun Xu,Bozhong Gu,Sen Wang,Jian-Qi You,Long-Xiang Shen,Ru-Wei Lu,Zhenyu Jin,Lin-Fei Chen,Ke Lou,Zhi Li,Guang-Qian Liu,Zhi Xu,Changhui Rao,Qi-Qian Hu,Ru-Feng Li,Hao-Wen Fu,Feng Wang,Men-Xian Bao,Ming-Chan Wu,Bo-Rong Zhang +20 more
TL;DR: The New Vacuum Solar Telescope (NVST) as discussed by the authors is a one meter vacuum solar telescope that aims to observe fine structures on the Sun, including measurements of the solar magnetic field.
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New Vacuum Solar Telescope and Observations with High Resolution
Zhong Liu,Jun Xu,Bozhong Gu,Sen Wang,Jian-Qi You,Long-Xiang Shen,Ru-Wei Lu,Zhenyu Jin,Lin-Fei Chen,Ke Lou,Zhi Li,Guang-Qian Lu,Zhi Xu,Changhui Rao,Qi-Qian Hu,Ru-Feng Li,Hao-Wen Fu,Men-Xian Bao,Ming-Chan Wu,Bo-Rong Zhang +19 more
TL;DR: The New Vacuum Solar Telescope (NVST) as discussed by the authors is a 1 meter vacuum solar telescope that aims to observe the fine structures on the Sun, including the measurements of solar magnetic field.
Journal ArticleDOI
Wavelength-diverse polarization modulators for Stokes polarimetry.
TL;DR: Polychromatic modulators as mentioned in this paper operate over a wide wavelength range with near-optimal polarimetric efficiency and are directly applicable to the next generation of multiline Stokes polarimeters.
Journal ArticleDOI
Wavelength-Diverse Polarization Modulators for Stokes Polarimetry
TL;DR: This work presents a new paradigm for the design of polarization modulators that operate over a wide wavelength range with near-optimal polarimetric efficiency and are directly applicable to the next generation of multiline Stokes polarimeters.
Journal ArticleDOI
Deriving telescope mueller matrices using daytime sky polarization observations
TL;DR: In this article, an efficient method was described for recovering the input polarization state of the light and the full 4 × 4 Mueller matrix of the telescope with an accuracy of a few percent without external masks or telescope hardware modification.
References
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Journal ArticleDOI
Stokes profile analysis and vector magnetic fields. VI: Fine scale structure of a sunspot
TL;DR: In this article, the vector magnetic field structure of a small, symmetric sunspot observed very close to disk center was explored using data from the High Altitude Observatory/National Solar Observatory Advanced Stokes Polarimeter (ASP).
Journal ArticleDOI
Optimum modulation and demodulation matrices for solar polarimetry.
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Journal ArticleDOI
Imaging Stokes polarimetry with piezoelastic modulators and charge-coupled-device image sensors
TL;DR: In this article, two piezoelastic polarization modulators are used in combination with charge-coupled-device (CCD) image sensors to simultaneously record all four Stokes parameters.
Journal ArticleDOI
Performance characteristics of the Advanced Stokes Polarimeter
TL;DR: In this article, Lites, Martinez Pillet, and Skumanich pointed out some limitations of vector magnetometry by the use of a generic filter magnetograph and made incorrect statements regarding the performance characteristics of the Advanced Stokes Polarimeter (ASP).
Journal ArticleDOI
Evaluation of seeing-induced cross talk in tip-tilt-corrected solar polarimetry
TL;DR: In this first attempt to understand the major issues, the influence of residual image motion (tip-tilt) corrections of operational AO systems on the cross talk between Stokes parameters and present results for several polarization analysis schemes are analyzed.
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