Issue |
A&A
Volume 690, October 2024
|
|
---|---|---|
Article Number | L15 | |
Number of page(s) | 6 | |
Section | Letters to the Editor | |
DOI | https://doi.org/10.1051/0004-6361/202452276 | |
Published online | 21 October 2024 |
Letter to the Editor
Spectral characteristics of a rotating solar prominence in multiple wavelengths
1
Centre for mathematical Plasma Astrophysics, KU Leuven, Celestijnenlaan 200B, 3001
Leuven, Belgium
2
Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482
Potsdam, Germany
3
SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ
UK
Received:
17
September
2024
Accepted:
3
October
2024
We present synthetic spectra corresponding to a 2.5D magnetohydrodynamic simulation of a rotating prominence in the Ca II 8542 Å, H α, Ca II K, Mg II k, Ly α, and Ly β lines. The prominence rotation resulted from angular momentum conservation within a flux rope where asymmetric heating imposed a net rotation prior to the thermal-instability-driven condensation phase. The spectra were created using a library built on the Lightweaver framework called Promweaver, which provides boundary conditions for incorporating the limb-darkened irradiation of the solar disk on isolated structures such as prominences. Our spectra show distinctive rotational signatures for the Mg II k, Ly α, and Ly β lines, even in the presence of complex, turbulent solar atmospheric conditions. However, these signals are barely detectable for the Ca II 8542 Å, H α, and Ca II K spectral lines. Most notably, we find only a very faint rotational signal in the H α line, thus reigniting the discussion on the existence of sustained rotation in prominences.
Key words: magnetohydrodynamics (MHD) / radiative transfer / Sun: atmosphere / Sun: corona / Sun: filaments / prominences
© The Authors 2024
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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