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Calibration of a full-disc longitudinal magnetogram at the Huairou Solar Observing Station
Wang, Xiaofan; Su, Jiangtao; Zhang, Hongqi
2010-08-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume406Issue:2Pages:1166-1176
AbstractBased on a spectral profile analysis of a filter magnetograph and the application of the astronomical data analysis technique, a full-disc distribution of Stokes I-to-V crosstalk in the solar magnetism and activity telescope (SMAT) has been acquired quantitatively. We produce a correction template to remove the full-disc Stokes I-to-V crosstalk. This template is important for the accuracy of the full-disc longitudinal magnetogram. Then, we propose an observational calibration method under the weak-field approximation on the basis of the scanning spectrum of the filter magnetograph. The following main results have been obtained. (i) For the original Stokes V images, there is about -1.67 x 10(-3) of Stokes I crosstalk into V at all wavelength positions, and this crosstalk presents itself as a horse-saddle surface distribution on the full disc. (ii) A sample of the calibration curve at different wavelength positions is given. (iii) After being calibrated into magnetic flux density, the Stokes I-to-V crosstalk has an amplitude of about 50 G, but introduces negative and positive spurious magnetic fields into the blue and red wing magnetograms, respectively.
KeywordTechniques: Polarimetric Sun: Photosphere Sun: Surface Magnetism
DOI10.1111/j.1365-2966.2010.16745.x
Indexed BySCI
Language英语
WOS IDWOS:000280710300036
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7798
Collection太阳物理研究部
AffiliationChinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Wang, Xiaofan,Su, Jiangtao,Zhang, Hongqi. Calibration of a full-disc longitudinal magnetogram at the Huairou Solar Observing Station[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2010,406(2):1166-1176.
APA Wang, Xiaofan,Su, Jiangtao,&Zhang, Hongqi.(2010).Calibration of a full-disc longitudinal magnetogram at the Huairou Solar Observing Station.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,406(2),1166-1176.
MLA Wang, Xiaofan,et al."Calibration of a full-disc longitudinal magnetogram at the Huairou Solar Observing Station".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 406.2(2010):1166-1176.
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