A spectroscopic survey of infrared 1-4{\mu}m spectra in regions of prominent solar coronal emission lines of Fe XIII, Si X, and Si IX

TL;DR

This paper analyzes infrared solar spectra around key emission lines to improve calibration and data interpretation for upcoming DKIST observations, aiding in the extraction of physical solar coronal parameters.

Contribution

It provides a detailed spectral analysis around specific infrared coronal lines to support calibration and inversion procedures for DKIST solar observations.

Findings

Identification of photospheric and telluric lines near coronal emission features

Calibration data to enhance spectral inversion accuracy

Preparation of data products for DKIST Level-2 processing

Abstract

The infrared solar spectrum contains a wealth of physical data about the Sun and is being explored using modern detectors and technology with new ground-based solar telescopes. One such instrument will be the ground-based Cryogenic Near-IR Spectro-Polarimeter of the Daniel K. Inouye Solar Telescope that will be capable of sensitive imaging of the faint infrared solar coronal spectra with full Stokes I, Q, U, and V polarization states. Highly ionized magnetic dipole emission lines have been observed in galaxies and the solar corona. Quantifying the accuracy of spectral inversion procedures requires a precise spectroscopic calibration of observations. A careful interpretation of the spectra around prominent magnetic dipole lines is essential for deriving physical parameters, and particularly, for quantifying the off-limb solar coronal observations from DKIST. In this work, we aim to provide an analysis of the spectral regions around the infrared coronal emission lines of Fe XIII 1074.68 nm, Fe XIII 1079.79 nm, Si X 1430.10 nm, and Si IX 3934.34 nm, aligning with the goal of identifying solar photospheric and telluric lines that will help facilitate production of reliable inversions and data products from four sets of solar coronal observations. The outputs will be integrated in the processing pipeline to produce Level-2 science-ready data that will be made available to DKIST observers.