Multi-wavelength spectropolarimetric observations of AR13724 performed by GRIS

¹ Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain
² Departamento de Astrofísica, Univ. de La Laguna, La Laguna, Tenerife E-38200, Spain

^⋆ Corresponding author: carlos.quintero@iac.es

Received: 13 December 2024
Accepted: 17 April 2025

Abstract

Multi-line spectropolarimetric observations allow the simultaneous inference of the magnetic field in 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 by allowing for the simultaneous observation of the Ca II line at 8542 Å, the Si I line at 10827 Å, and the He I triplet at 10830 Å in addition to some additional weaker spectral lines that can probe a greater depth in the photosphere. Because these spectral lines are sensitive to the plasma properties in different regions of the solar atmosphere, their combined analysis can help us to understand the stratification of its thermal and magnetic properties from the photosphere to the chromosphere. We show recent observations made with the upgraded GRIS of active region AR13724 that show the instrument potential for unravelling the most minute details of solar phenomena. In particular, we analysed 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 conducted a preliminary data analysis using relatively simple and approximate methods.