Toward the analysis of waves in the solar atmosphere based on NLTE spectral synthesis from 3D MHD simulations

TL;DR

This paper investigates wave behavior in the solar atmosphere using NLTE spectral synthesis from 3D MHD simulations, aiming to better understand wave propagation and spectral line formation in magnetic regions.

Contribution

It introduces a novel approach combining 3D MHD simulations with NLTE spectral synthesis to analyze wave dynamics in the solar atmosphere.

Findings

Detected upward traveling waves in magnetic regions.

Observed dispersion relation varies with magnetic regime.

Noted unexpected increase in travel times below the acoustic cut-off.

Abstract

From the analysis of Dopplergrams in the K I 7699 A and Na I 5890 A spectral lines observed with the Magneto-Optical filter at Two Heights (MOTH) experiment during the austral summer in 2002-03 we find upward traveling waves in magnetic regions. Our analysis shows that the dispersion relation of these waves strongly depends on whether the wave is detected in the low-beta or high-beta regime. Moreover, the observed dispersion relation does not show the expected decrease of the acoustic cut-off frequency for the field guided slow magnetic wave. Instead, we detected an increase of the travel times below the acoustic cut-off frequency and at the same time a decrease of the travel time above it. To study the formation height of the spectral lines employed by MOTH in greater detail we are currently in the process of employing 3D MHD simulations carried out with CO5BOLD to perform NLTE spectral synthesis.