Multi-wavelength spectropolarimetric observations of AR13724 performed by GRIS

Abstract

Multi-line spectropolarimetric observations allow for the simultaneous inference of the magnetic field at different layers of the solar atmosphere and provide insight into how these layers are magnetically coupled. The new upgrade of the Gregor Infrared Spectrograph (GRIS) instrument offers such a possibility, allowing for the simultaneous observation of the Ca II line at 8542 A, the Si I line at 10827 A, and the He I triplet at 10830 A in addition to some additional weaker spectral lines that can probe deeper in the photosphere. Because these spectral lines are sensitive to the plasma properties at different regions of the solar atmosphere, their combined analysis can help understand the stratification of its thermal and magnetic properties from the photosphere to the chromosphere. This work showcases recent observations of the upgraded GRIS at the active region AR13724, which shows the instrument's potential for unravelling the most minute details of solar phenomena. In particular, we analyse the spatial distribution of the polarisation signals as well as the distribution of Stokes profiles for different regimes of the magnetic field strength. We also conduct a preliminary data analysis using relatively simple and approximate methods.

13 pages, 14 figures

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Cited by in corpus (1)

• The magnetic sensitivity of the Ca II resonance and subordinate lines in the solar atmosphere