# Mapping the magnetic field of flare coronal loops

## TL;DR

This study presents high-resolution spectropolarimetric observations of solar flare coronal loops, revealing magnetic field strengths up to 350 Gauss at significant heights, challenging previous estimates and impacting solar atmospheric models.

## Contribution

It provides the first precise magnetic field measurements of flare coronal loops at the solar limb using spectropolarimetry and the weak-field approximation.

## Key findings

- Magnetic fields up to 350 Gauss detected at 25 Mm height.
- Measurements are significantly higher than previous estimates.
- Implications for understanding the solar atmosphere's magnetic structure.

## Abstract

Here we report on the unique observation of flaring coronal loops at the solar limb using high resolution imaging spectropolarimetry from the Swedish 1-meter Solar Telescope. The vantage position, orientation and nature of the chromospheric material that filled the flare loops allowed us to determine their magnetic field with unprecedented accuracy using the weak-field approximation method. Our analysis reveals coronal magnetic field strengths as high as 350 Gauss at heights up to 25 Mm above the solar limb. These measurements are substantially higher than a number of previous estimates and may have considerable implications for our current understanding of the extended solar atmosphere.