Nonlinear calibration of vector magnetograms by the video vector magnetograph at Huairou
文献类型：期刊论文
| 作者 | Ruan, Guiping; Zhang, Hongqi
|
| 刊名 | NEW ASTRONOMY
 |
| 出版日期 | 2006-12-01 |
| 卷号 | 12期号:3页码:215-223 |
| 关键词 | sun : nonlinear calibration sun : magnetic fields |
| 英文摘要 | We compare the results of two calibration methods for deriving a photospheric vector magnetogram, as applied to the Fei 5324.19 angstrom line. The first method ignores the dependence of its calibration coefficients on the inclination angle. The second method is a multi-iteration, nonlinear calibration technique developed by [M.J. Hagyard, J.I. Kineke, Solar Phys. 158 (1995) 11], which allows the polarization signals to depend on both field strength and inclination angle. We compare the relationship between the derived solar magnetic field and the Stokes parameters under both methods. We find that the circular polarization signal of the Fei 5324.19 A line is linearly proportional to the longitudinal strength, B(L), when the field strength ranges from 0 to 1000 Gauss. For B(L) > 1000 G and inclination angles ranging from 30 degrees to 90 degrees, deviation from linearity is significant. For the transverse field, B(T), the assumption of linearity only holds for 0 < B(T) < 300 G. In contrast to the former method of calibration, the improved calibration method accounts for the nonlinear relationship between polarization signals and the magnetic field strength. Using [A. Skumanich, in: J.H. Thomas and N.O. Weiss (Eds.), Sunspots: Theory and Observations. Kluwer, Dordrecht, 1992, p. 121] dipole field model., we show that the Fei 5324.19 angstrom line has more linear property than the Fei 6302.5 angstrom line. (c) 2006 Elsevier B.V. All rights reserved. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000243175900007 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7086]  |
| 专题 | 国家天文台_太阳物理研究部 |
| 作者单位 | Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ruan, Guiping,Zhang, Hongqi. Nonlinear calibration of vector magnetograms by the video vector magnetograph at Huairou[J]. NEW ASTRONOMY,2006,12(3):215-223. |
| APA | Ruan, Guiping,&Zhang, Hongqi.(2006).Nonlinear calibration of vector magnetograms by the video vector magnetograph at Huairou.NEW ASTRONOMY,12(3),215-223. |
| MLA | Ruan, Guiping,et al."Nonlinear calibration of vector magnetograms by the video vector magnetograph at Huairou".NEW ASTRONOMY 12.3(2006):215-223. |
入库方式： OAI收割
来源：国家天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。