A Study on Magnetic-Sensitivity Wavelength Position of the Working Line Used by the Full-Disk Magnetograph Onboard the Advanced Space Based Solar Observatory (ASO-S/FMG)

IF 2.7 3区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Solar Physics Pub Date : 2024-05-24 DOI:10.1007/s11207-024-02311-0

S. Liu, J. T. Su, X. Y. Bai, Y. Y. Deng, J. Chen, Y. L. Song, X. F. Wang, H. Q. Xu, X. Yang, Shahid Idrees

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引用次数: 0

Abstract

Utilizing data from the Solar Magnetism and Activity Telescope (SMAT), analytical solutions of polarized radiative transfer equations, and in-orbit test data for the Full-disk Magnetograph (FMG) onboard the Advanced Space based Solar Observatory (ASO-S), this study reveals the magnetic-sensitivity spectral positions for the Fe i \(\lambda \) 5234.19 Å working line used by FMG. From the experimental data of SMAT, it is found that the most sensitive position is located at the line center for linear polarization (Stokes Q/U), while it is about −0.07 Å away from the line center for circular polarization (Stokes V). Moreover, both the theoretical analysis and the in-orbit test data analysis of FMG confirm the above results. Additionally, the theoretical analysis suggests the presence of distinct spectral pockets (centered at 0.08 – 0.15 Å) from the line, harboring intense magnetic sensitivity across all three Stokes parameters. Striking a balance between high sensitivity for both linear and circular polarization, while capturing additional valuable information, a spectral position of −0.08 Å emerges as the champion for routine FMG magnetic field observations.

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关于先进天基太阳观测站（ASO-S/FMG）搭载的全磁盘磁强计所使用的工作线的磁灵敏度波长位置的研究

本研究利用太阳磁性和活动望远镜（SMAT）的数据、偏振辐射传递方程的解析解以及先进天基太阳观测站（ASO-S）上的全盘磁力仪（FMG）的在轨测试数据，揭示了FMG使用的Fe i （\lambda \）5234.19 Å工作线的磁敏感光谱位置。从 SMAT 的实验数据中可以发现，在线性偏振（斯托克斯 Q/U）情况下，最灵敏的位置位于线中心，而在圆极化（斯托克斯 V）情况下，最灵敏的位置距离线中心约 -0.07 Å。此外，FMG 的理论分析和在轨测试数据分析都证实了上述结果。此外，理论分析表明，在所有三个斯托克斯参数中，从该线开始存在明显的光谱袋（以 0.08 - 0.15 Å 为中心），蕴藏着强烈的磁敏感性。为了在线性偏振和圆偏振的高灵敏度之间取得平衡，同时捕捉到更多有价值的信息，-0.08 Å 光谱位置成为常规 FMG 磁场观测的首选。

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来源期刊

Solar Physics 地学天文-天文与天体物理

CiteScore

5.10

自引率

17.90%

发文量

146

审稿时长

1 months

期刊介绍： Solar Physics was founded in 1967 and is the principal journal for the publication of the results of fundamental research on the Sun. The journal treats all aspects of solar physics, ranging from the internal structure of the Sun and its evolution to the outer corona and solar wind in interplanetary space. Papers on solar-terrestrial physics and on stellar research are also published when their results have a direct bearing on our understanding of the Sun.