Derivation of instrument requirements for polarimetry using Mg, Fe, and Mn lines between 250 and 290 nm

Judge et al. recently argued that a region of the solar spectrum in the near-UV between about 250 and 290 nm is optimal for studying magnetism in the solar chromosphere, due to an abundance of Mg ii, Fe ii, and Fe i lines that sample various heights in the solar atmosphere. In this paper, we derive requirements for spectropolarimetric instruments to observe these lines. We derive a relationship between the desired sensitivity to magnetic field and the signal-to-noise ratio of the measurement from the weak-field approximation of the Zeeman effect. We find that many lines will exhibit observable polarization signals for both longitudinal and transverse magnetic field with reasonable amplitudes.

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Author de Wijn, Alfred G.
Judge, Philip G.
Ezzeddine, R.
Sainz Dalda, A.
Publisher UCAR/NCAR - Library
Publication Date 2023-08-01T00:00:00
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Topic Category geoscientificInformation
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Metadata Date 2025-07-11T15:15:42.298289
Metadata Record Identifier edu.ucar.opensky::articles:26530
Metadata Language eng; USA
Suggested Citation de Wijn, Alfred G., Judge, Philip G., Ezzeddine, R., Sainz Dalda, A.. (2023). Derivation of instrument requirements for polarimetry using Mg, Fe, and Mn lines between 250 and 290 nm. UCAR/NCAR - Library. https://n2t.org/ark:/85065/d7w66qsj. Accessed 02 December 2025.

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