The impact of the angle-average approximation in the partial frequency redistribution modeling of the Mg ii h–k Doublet Stokes Profiles

del Pino Alemán, Tanausú; Alsina Ballester, Ernest; Trujillo Bueno, Javier; Janett, Gioele; Riva, Fabio Matteo; Belluzzi, Luca

doi:10.3847/1538-4357/ad95f7

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Journal article

The impact of the angle-average approximation in the partial frequency redistribution modeling of the Mg ii h–k Doublet Stokes Profiles

del Pino Alemán, Tanausú Instituto de Astrofísica de Canarias, La Laguna, Tenerife, Spain - Departamento de Astrofísica, Universidad de La Laguna, Tenerife, Spain
Alsina Ballester, Ernest Instituto de Astrofísica de Canarias, La Laguna, Tenerife, Spain - Departamento de Astrofísica, Universidad de La Laguna, Tenerife, Spain
Trujillo Bueno, Javier Instituto de Astrofísica de Canarias, La Laguna, Tenerife, Spain - Departamento de Astrofísica, Universidad de La Laguna, Tenerife, Spain - Consejo Superior de Investigaciones Científicas, Spain
Janett, Gioele ORCID Istituto ricerche solari Aldo e Cele Daccò (IRSOL), Faculty of Informatics, Università della Svizzera italiana Switzerland - Euler Institute (EUL), Università della Svizzera italiana, Switzerland
Riva, Fabio Matteo ORCID Istituto ricerche solari Aldo e Cele Daccò (IRSOL), Faculty of Informatics, Università della Svizzera italiana Switzerland - Euler Institute (EUL), Università della Svizzera italiana, Switzerland
Belluzzi, Luca ORCID Istituto ricerche solari Aldo e Cele Daccò (IRSOL), Faculty of Informatics, Università della Svizzera italiana Switzerland - Euler Institute (EUL), Università della Svizzera italiana, Switzerland - Institut für Sonnenphysik (KIS), Freiburg i. Br., Germany

2024

Published in:

The Astrophysical Journal. - 2024, vol. 978, no. 1, p. 27

English In recent years, the Mg ii h and k lines have become increasingly important for the diagnostics of magnetic fields in the solar chromosphere, motivated both by the advances in the modeling capabilities of their polarization and by the unprecedented spectropolarimetric observations provided by the CLASP missions. In this paper, we investigate the impact of the angular and frequency coupling in coherent scattering processes in the radiative transfer modeling of the Mg ii doublet polarization profiles. In particular, we aim to assess how the widely used angle-average approximation affects the predicted polarization. By solving the radiative transfer problem in 1D semiempirical atmospheric models, we find that this approximation is suitable in the absence of magnetic fields, but there can be measurable differences in magnetized models, mainly in the linear polarization profiles close to the core of the Mg ii k line. We then test the suitability of the approximation in more realistic scenarios, solving the radiative transfer problem pixel-by-pixel in a 3D atmospheric model resulting from a magnetohydrodynamic simulation and mimicking the degradation of the CLASP2 instrument, as well as in several 1D atmospheric models resulting from the Stokes inversion of the CLASP2 data. We find that the impact of the angle-average approximation is greatly diminished at the resolution of the CLASP2 observations. We also find that to suitably include angle-dependent effects in 1D radiative transfer modeling, it is sufficient to initialize the problem with the angle-average solution and then perform a few (angle-dependent) iterations, dramatically reducing the computational cost.

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