Spectropolarimetry of Chromospheric Magnetic and Velocity Structure Above Active Regions

TL;DR

This paper presents high-resolution spectropolarimetric observations of magnetic and velocity structures in the chromosphere above active regions, revealing details of magnetic fields and flows using advanced instrumentation.

Contribution

It demonstrates the application of the Facility Infrared Spectropolarimeter (FIRS) for detailed imaging-spectropolarimetry of multiple spectral lines in active regions.

Findings

Maps of photospheric and chromospheric magnetic fields above a sunspot

Characterization of chromospheric flow structures around active regions

Insights into the magnetic and flow dynamics in the chromosphere

Abstract

Active regions often host large-scale gas flows in the chromosphere presumably directed along curved magnetic field lines. Spectropolarimetric observations of these flows are critical to understanding the nature and evolution of their anchoring magnetic structure. We discuss recent work with the Facility Infrared Spectropolarimeter (FIRS) located at the Dunn Solar Telescope in New Mexico to achieve high resolution imaging-spectropolarimetry of the Fe I lines at 630 nm, the Si I line at 1082.7 nm, and the He I triplet at 1083 nm. We present maps of the photospheric and chromospheric magnetic field vector above a sunspot as well as discuss characteristics of surrounding chromospheric flow structures.