On the Branching in the Emission Relations of Ca II lines in Solar Prominences
G. Stellmacher, E. Wiehr
TL;DR
This study investigates the emission relations of Ca II lines and H-beta in solar prominences, revealing non-thermal broadening effects and large-scale motions affecting calcium line widths.
Contribution
It provides new insights into the non-thermal broadening mechanisms influencing Ca II emissions in solar prominences, highlighting the role of unresolved fine-structure motions.
Findings
Confirmed branching in Ca II and H-beta emission relations.
Identified non-thermal broadening as a key factor in line widths.
Large-scale motions contribute to calcium line broadening.
Abstract
We observe simultaneously the Ca II K, Ca II 8542 and H-beta emissions in solar prominences at high spatial and spectral resolution. We confirm a branching in the emission relations of Ca II and H-beta. This is related to non-thermal line broadening, which affects the Ca II lines much more than H-beta. The classical non-thermal (Maxwell) line broadening, determined by comparison of the width of hydrogen lines with those from calcium lines, is not sufficient to explain the Ca II widths. This indicates an additional broadening by large-scale motions of the unresolved prominence fine-structure.
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