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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)

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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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Data Availability

No datasets were generated or analysed during the current study.

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Funding

This work is supported by National Key R&D Program of China (Nos. 2022YFF0503001, 2021YFA1600500, and 2021YFA1600503), the Strategic Priority Research Program on Space Science of Chinese Academy of Sciences (Grant No. XDB0560000), and the Natural Science Foundation of China (Grant Nos. 12273059, 11203036, 11703042, U1731241, 11427901, 11473039, 11427901, and 11178016), and the Youth Innovation Promotion Association of CAS(2023061). ASO-S mission is supported by the Strategic Priority Research Program on Space Science, the Chinese Academy of Sciences, Grant No. XDA15320000.

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Authors and Affiliations

  1. National Astronomical Observatories, Chinese Academy of Science, Beijing, 100101, China

    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

  2. Key Laboratory of Solar Activity and Space Weather, National Space Science Center, Chinese Academy of Science, Beijing, 100190, China

    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

  3. School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing, 100101, China

    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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  1. S. Liu
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Contributions

S. Liu, J.T. Su and X.Y. bai carried out this work and S. Liu was responsible for the data analysis. X.Y. Bai provided suggestions on data processing and data analysis. J. Chen, Y.L. Song, X.F. Wang, H.Q. Xu, and X. Yang gave overall suggestions for discussion and publication.

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Correspondence to S. Liu.

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Liu, S., Su, J.T., Bai, X.Y. et al. 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). Sol Phys 299, 70 (2024). https://doi.org/10.1007/s11207-024-02311-0

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