Spectropolarimetric inversions of the Ca II 8498 A and 8542 A lines in the quiet Sun

TL;DR

This study uses non-LTE spectropolarimetric inversions of Ca II lines to analyze the physical properties of the quiet Sun's photosphere and chromosphere, revealing inhomogeneity and temperature variations across different magnetic regions.

Contribution

It demonstrates the effectiveness of non-LTE inversion techniques in recovering detailed physical parameters of the quiet Sun from spectropolarimetric data, highlighting chromospheric inhomogeneity.

Findings

Distinct temperature ranges in the chromosphere linked to magnetic regions

Inversions reveal increased inhomogeneity with height in the chromosphere

Magnetic flux influences temperature distribution in the quiet Sun

Abstract

We study non-LTE inversions of the Ca II infrared triplet lines as a tool for inferring physical properties of the quiet Sun. The inversion code is successful in recovering the temperature, velocity and longitudinal magnetic flux density in the photosphere and chromosphere, but the height range where the inversions are sensitive is limited, especially in the chromosphere. We present results of inverting spectropolarimetric observations of the lines in a quiet Sun region. We find three distinct ranges in chromospheric temperature: low temperatures in the internetwork, high temperatures in the enhanced magnetic network and intermediate temperatures associated with low magnetic flux regions in the network. The differences between these regions become more pronounced with height as the plasma-$\beta$ decreases. These inversions support the picture of the chromosphere, especially close to the magnetic network, being highly inhomogeneous both in the vertical and horizontal directions.