Effect of cross-redistribution on the resonance scattering polarization of O {\sc i} line at 1302 \AA\,

TL;DR

This study investigates how cross-redistribution affects the resonance scattering polarization of the O I 1302 Å line in the solar atmosphere, emphasizing the importance of multi-dimensional radiative transfer modeling.

Contribution

We developed a new 2D radiative transfer code incorporating cross-redistribution effects to analyze polarization signals in the O I line, advancing solar chromospheric diagnostics.

Findings

Multi-dimensional radiative transfer is crucial for accurate polarization modeling.

Cross-redistribution effects significantly influence the amplitude and shape of polarization signals.

The developed code successfully reproduces observed polarization features.

Abstract

Oxygen is the most abundant element on the Sun after Hydrogen and Helium. The intensity spectrum of resonance lines of neutral Oxygen namely O {\sc i} (1302, 1305 and 1306 \AA\,) has been studied in the literature for chromospheric diagnostics. In this paper we study the resonance scattering polarization in the O {\sc i} line at 1302 \AA\, using two-dimensional radiative transfer in a composite atmosphere constructed using a two-dimensional magneto-hydrodynamical snapshot in the photosphere and columns of the one-dimensional FALC atmosphere in the chromosphere. The methods developed by us recently in a series of papers to solve multi-dimensional polarized radiative transfer have been incorporated in our new code POLY2D which we use for our analysis. We find that multi-dimensional radiative transfer including XRD effects is important in reproducing the amplitude and shape of scattering polarization signals of the O {\sc i} line at 1302 \AA\,.