Observation and Modeling of the circular polarization of the Cr I magnetic field induced transition at 533.03 nm
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866929262955593728 |
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| author | Li, Hao Alemán, Tanausú del Pino Bueno, Javier Trujillo Zeuner, Franziska |
| author_facet | Li, Hao Alemán, Tanausú del Pino Bueno, Javier Trujillo Zeuner, Franziska |
| contents | We study the circular polarization of the magnetic field induced transition (MIT) between the $3d^5(^6S)4d\ ^7D_2$ and $3d^5(^6S)4p\ ^7P_4^\circ$ states of \ion{Cr}{1} at 533.03~nm (wavelength in air). The fractional circular polarization $V/I$ of this spectral line resulting from the solution of the radiation transfer problem in a sunspot model permeated by a homogeneous magnetic field of 3~kG shows amplitudes of about $2\%$. Spectro-polarimetric observations of two sunspots were obtained with the Zurich Imaging Polarimeter-3 at the Istituto ricerche solari Aldo e Cele Daccò (IRSOL) observatory observatory in Locarno, Switzerland. The observed $V/I$ profiles show approximately anti-symmetrical shapes with an amplitude of around $0.1\%$ and $0.2\%$ for the two sunspots. The center of this profile coincides with the wavelengths predicted for the above-mentioned MIT. We apply an inversion code to the spectro-polarimetric data of the \ion{Cr}{1} permitted lines at 532.91 and 532.98~nm, as well as to the MIT line at 533.03~nm, to infer a stratification of the emitting atmosphere. We compare the $V/I$ profiles synthesized in the inferred atmosphere models with the observations, showing that the observed signal likely corresponds to the MIT line. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_01409 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Observation and Modeling of the circular polarization of the Cr I magnetic field induced transition at 533.03 nm Li, Hao Alemán, Tanausú del Pino Bueno, Javier Trujillo Zeuner, Franziska Solar and Stellar Astrophysics We study the circular polarization of the magnetic field induced transition (MIT) between the $3d^5(^6S)4d\ ^7D_2$ and $3d^5(^6S)4p\ ^7P_4^\circ$ states of \ion{Cr}{1} at 533.03~nm (wavelength in air). The fractional circular polarization $V/I$ of this spectral line resulting from the solution of the radiation transfer problem in a sunspot model permeated by a homogeneous magnetic field of 3~kG shows amplitudes of about $2\%$. Spectro-polarimetric observations of two sunspots were obtained with the Zurich Imaging Polarimeter-3 at the Istituto ricerche solari Aldo e Cele Daccò (IRSOL) observatory observatory in Locarno, Switzerland. The observed $V/I$ profiles show approximately anti-symmetrical shapes with an amplitude of around $0.1\%$ and $0.2\%$ for the two sunspots. The center of this profile coincides with the wavelengths predicted for the above-mentioned MIT. We apply an inversion code to the spectro-polarimetric data of the \ion{Cr}{1} permitted lines at 532.91 and 532.98~nm, as well as to the MIT line at 533.03~nm, to infer a stratification of the emitting atmosphere. We compare the $V/I$ profiles synthesized in the inferred atmosphere models with the observations, showing that the observed signal likely corresponds to the MIT line. |
| title | Observation and Modeling of the circular polarization of the Cr I magnetic field induced transition at 533.03 nm |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2403.01409 |