# First detection of sign-reversed linear polarization from the forbidden [O I] 630.03 nm line

## TL;DR

This paper reports the first detection of sign-reversed linear polarization in the forbidden [O I] 630.03 nm line, providing new insights into solar oxygen abundance measurements through high signal-to-noise spectro-polarimetric observations.

## Contribution

It introduces the first observation of sign-reversed linear polarization in a forbidden line, using a novel averaging technique for high S/N, aiding solar oxygen abundance studies.

## Key findings

- Confirmed sign-reversal of polarization in forbidden line
- Demonstrated dominance of magnetic dipole transition
- Enabled new method for disentangling Ni I blend

## Abstract

We report on the detection of linear polarization of the forbidden [O i] 630.03 nm spectral line. The observations were carried out in the broader context of the determination of the solar oxygen abundance, an important problem in astrophysics that still remains unresolved. We obtained spectro-polarimetric data of the forbidden [O i] line at 630.03 nm as well as other neighboring permitted lines with the Solar Optical Telescope of the Hinode satellite. A novel averaging technique was used, yielding very high signal-to-noise ratios in excess of $10^5$. We confirm that the linear polarization is sign-reversed compared to permitted lines as a result of the line being dominated by a magnetic dipole transition. Our observations open a new window for solar oxygen abundance studies, offering an alternative method to disentangle the Ni i blend from the [O i] line at 630.03 nm that has the advantage of simple LTE formation physics.