Hanle effect in the solar Ba II D2 line: a diagnostic tool for chromospheric weak magnetic fields

TL;DR

This paper explores the use of the Hanle effect on the Ba II D2 line to diagnose weak magnetic fields in the solar chromosphere, addressing the lack of direct measurement tools.

Contribution

It demonstrates the diagnostic potential of the Hanle effect on the Ba II D2 line for measuring weak chromospheric magnetic fields.

Findings

Hanle effect can effectively diagnose weak magnetic fields in the chromosphere.

Ba II D2 line polarization is sensitive to magnetic field strength.

Provides a new tool for chromospheric magnetic field measurement.

Abstract

The physics of the solar chromosphere depends in a crucial way on its magnetic structure. However there are presently very few direct magnetic field diagnostics available for this region. Here we investigate the diagnostic potential of the Hanle effect on the Ba II D2 line resonance polarization for the determination of weak chromospheric turbulent magnetic fields......