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| Main Authors: | , , , |
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| Format: | Preprint |
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2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2406.02083 |
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| _version_ | 1866909277189308416 |
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| author | Mathur, Harsh Nagaraju, K. Yadav, Rahul Joshi, Jayant |
| author_facet | Mathur, Harsh Nagaraju, K. Yadav, Rahul Joshi, Jayant |
| contents | We present spectropolarimetric observations of an active region recorded simultaneously in the H$α$ Ca II 8662 Å lines. The sunspot exhibits multiple structures, including a lightbridge and a region where Ca II 8662 Å line core is in emission. Correspondingly, the H$α$ line core image displays brightening in the emission region, with the spectral profiles showing elevated line cores. The stratification of the line-of-sight magnetic field is inferred through non-LTE multiline inversions of the Ca II 8662 Å line and the weak field approximation over the H$α$ line. The field strength inferred from the H$α$ line core is consistently smaller than that inferred from inversions at $\log τ_{500}$ = $-$4.5. However, the study finds no correlation between the WFA over the core of the H$α$ line and that inferred from inversions at $\log τ_{500}$ = $-$4.5. In regions exhibiting emission features, the morphology of the magnetic field at $\log τ_{500}$ = $-$4.5 resembles that at $\log τ_{500}$ = $-$1, with slightly higher or comparable field strengths. The magnetic field morphology inferred from the core of the H$α$ line is also similar to that inferred from the full spectral range of the H$α$ line in the emission region. The field strength inferred in the lightbridge at $\log τ_{500}$ = $-$1 is smaller than the surrounding umbral regions and comparable at $\log τ_{500}$ = $-$4.5. Similarly, the field strength inferred in the lightbridge from the WFA over the H$α$ line appears lower compared to the surrounding umbral regions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_02083 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Simultaneous spectropolarimetric observations in the H$α$ and Ca II 8662 Å lines of an active region Mathur, Harsh Nagaraju, K. Yadav, Rahul Joshi, Jayant Solar and Stellar Astrophysics We present spectropolarimetric observations of an active region recorded simultaneously in the H$α$ Ca II 8662 Å lines. The sunspot exhibits multiple structures, including a lightbridge and a region where Ca II 8662 Å line core is in emission. Correspondingly, the H$α$ line core image displays brightening in the emission region, with the spectral profiles showing elevated line cores. The stratification of the line-of-sight magnetic field is inferred through non-LTE multiline inversions of the Ca II 8662 Å line and the weak field approximation over the H$α$ line. The field strength inferred from the H$α$ line core is consistently smaller than that inferred from inversions at $\log τ_{500}$ = $-$4.5. However, the study finds no correlation between the WFA over the core of the H$α$ line and that inferred from inversions at $\log τ_{500}$ = $-$4.5. In regions exhibiting emission features, the morphology of the magnetic field at $\log τ_{500}$ = $-$4.5 resembles that at $\log τ_{500}$ = $-$1, with slightly higher or comparable field strengths. The magnetic field morphology inferred from the core of the H$α$ line is also similar to that inferred from the full spectral range of the H$α$ line in the emission region. The field strength inferred in the lightbridge at $\log τ_{500}$ = $-$1 is smaller than the surrounding umbral regions and comparable at $\log τ_{500}$ = $-$4.5. Similarly, the field strength inferred in the lightbridge from the WFA over the H$α$ line appears lower compared to the surrounding umbral regions. |
| title | Simultaneous spectropolarimetric observations in the H$α$ and Ca II 8662 Å lines of an active region |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2406.02083 |