Spectral Characteristics of a Rotating Solar Prominence in Multiple Wavelengths
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arXiv
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2024
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| author | Pietrow, A. G. M. Liakh, V. Osborne, C. M. J. Jenkins, J. Keppens, R. |
| author_facet | Pietrow, A. G. M. Liakh, V. Osborne, C. M. J. Jenkins, J. Keppens, R. |
| contents | We present synthetic spectra corresponding to a 2.5D magnetohydrodynamical 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 hardly detectable for the Ca II 8542 Å, H$α$, 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_03479 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spectral Characteristics of a Rotating Solar Prominence in Multiple Wavelengths Pietrow, A. G. M. Liakh, V. Osborne, C. M. J. Jenkins, J. Keppens, R. Solar and Stellar Astrophysics We present synthetic spectra corresponding to a 2.5D magnetohydrodynamical 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 hardly detectable for the Ca II 8542 Å, H$α$, 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. |
| title | Spectral Characteristics of a Rotating Solar Prominence in Multiple Wavelengths |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2410.03479 |