Non-LTE Analysis of Pre-eruptive Prominence Plasma Parameters Effects on the Lyman-beta and Lyman-gamma Lines with Solar Orbiter SPICE Observations

TL;DR

This study uses Solar Orbiter SPICE data to analyze how non-LTE plasma parameters influence hydrogen Lyman line formation in a prominence, refining physical parameters through observational constraints.

Contribution

Introduces a method to refine prominence plasma parameters by generating and analyzing 200 non-LTE models constrained by Solar Orbiter observations.

Findings

Identified key physical parameters affecting Lyman line formation.

Demonstrated the effectiveness of the modeling approach with observational data.

Provided insights into prominence plasma conditions using parallel coordinate plots.

Abstract

The first dedicated observation of an off-limb prominence by Solar Orbiter took place on April 15, 2023. Our aim is to determine the range of different physical parameters of this prominence and to examine how these parameters affect the formation of the Lyman $\beta$ and Lyman $\gamma$ lines of hydrogen. We have found a way to refine key physical parameters by observational data. We will test the method by this prominence observation. We generate 200 random non-LTE models using these observational constraints and compute the Lyman $\beta$ line and the Lyman $\gamma$ line profiles. We use the Spectral Imaging of the Coronal Environment (SPICE) full-disk mosaic from November 13, 2023 to constrain the incident radiation. We present the parameters and results of 200 random models using parallel coordinate plots to explore how different parameters affect the results. This allows us to infer the key physical parameters (e.g., central pressure, column mass and temperature gradient) that impact the formation of the Lyman $\beta$ line and the Lyman $\gamma$ line in this observation.