Coronal Magnetometry with EUV Permitted Lines
A major challenge in solar physics is to obtain empirical information on the magnetic field of the million-degree plasma of the solar corona. To this end, we need observables of the solar radiation sensitive to the coronal magnetic field. The most familiar observables are the polarization signals of...
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2025-01-01
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| Online Access: | https://doi.org/10.3847/1538-4357/addc61 |
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| author | Nataliia G. Shchukina Javier Trujillo Bueno Supriya Hebbur Dayananda Rafael Manso Sainz Andrii V. Sukhorukov |
| author_facet | Nataliia G. Shchukina Javier Trujillo Bueno Supriya Hebbur Dayananda Rafael Manso Sainz Andrii V. Sukhorukov |
| author_sort | Nataliia G. Shchukina |
| collection | DOAJ |
| description | A major challenge in solar physics is to obtain empirical information on the magnetic field of the million-degree plasma of the solar corona. To this end, we need observables of the solar radiation sensitive to the coronal magnetic field. The most familiar observables are the polarization signals of visible and near-infrared forbidden lines of highly ionized species and some ultraviolet permitted lines, like hydrogen Ly α . While the coronal radiation in these spectral lines can only be detected for off-limb lines of sight, the coronal radiation from permitted extreme ultraviolet (EUV) lines can be observed also on the solar disk. These coronal lines are mainly collisionally excited, but it has been pointed out that some permitted EUV lines can actually be linearly polarized if their lower level carries atomic alignment, and that their linear polarization is sensitive to the orientation of the coronal magnetic field . Here we theoretically investigate the linear polarization in permitted EUV lines of a variety of ions: Fe x , Fe xi , Fe xiii , Fe xiv , Si ix , and Si x . To this end, we have developed a numerical code, which we have applied to investigate the linear polarization and magnetic sensitivity of many permitted EUV lines in a one-dimensional model of the solar corona, providing a list of the most promising lines to be further investigated for polarimetry with future space telescopes. Our next step will be to extend this work by using state-of-the-art three-dimensional coronal models. |
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| institution | OA Journals |
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| language | English |
| publishDate | 2025-01-01 |
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| spelling | doaj-art-2e07e35cc7b94a11a47bbdcb3375e8242025-08-20T02:36:30ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-0198813310.3847/1538-4357/addc61Coronal Magnetometry with EUV Permitted LinesNataliia G. Shchukina0https://orcid.org/0000-0003-3958-9935Javier Trujillo Bueno1https://orcid.org/0000-0001-5131-4139Supriya Hebbur Dayananda2https://orcid.org/0000-0003-2752-7681Rafael Manso Sainz3Andrii V. Sukhorukov4Instituto de Astrofísica de Canarias , E-38205 La Laguna, Tenerife, Spain ; natasha-ext@iac.es; Main Astronomical Observatory, National Academy of Sciences , 03143 Kyiv, UkraineInstituto de Astrofísica de Canarias , E-38205 La Laguna, Tenerife, Spain ; natasha-ext@iac.es; Dpto. de Astrofísica, Universidad de La Laguna , E-38206 La Laguna, Tenerife, Spain; Consejo Superior de Investigaciones Científicas , SpainInstituto de Astrofísica de Canarias , E-38205 La Laguna, Tenerife, Spain ; natasha-ext@iac.es; Dpto. de Astrofísica, Universidad de La Laguna , E-38206 La Laguna, Tenerife, SpainThird Institute of Physics, University of Göttingen , Friedrich-Hund-Platz 1, 37077 Göttingen, GermanyInstituto de Astrofísica de Canarias , E-38205 La Laguna, Tenerife, Spain ; natasha-ext@iac.es; Main Astronomical Observatory, National Academy of Sciences , 03143 Kyiv, Ukraine; Dpto. de Astrofísica, Universidad de La Laguna , E-38206 La Laguna, Tenerife, SpainA major challenge in solar physics is to obtain empirical information on the magnetic field of the million-degree plasma of the solar corona. To this end, we need observables of the solar radiation sensitive to the coronal magnetic field. The most familiar observables are the polarization signals of visible and near-infrared forbidden lines of highly ionized species and some ultraviolet permitted lines, like hydrogen Ly α . While the coronal radiation in these spectral lines can only be detected for off-limb lines of sight, the coronal radiation from permitted extreme ultraviolet (EUV) lines can be observed also on the solar disk. These coronal lines are mainly collisionally excited, but it has been pointed out that some permitted EUV lines can actually be linearly polarized if their lower level carries atomic alignment, and that their linear polarization is sensitive to the orientation of the coronal magnetic field . Here we theoretically investigate the linear polarization in permitted EUV lines of a variety of ions: Fe x , Fe xi , Fe xiii , Fe xiv , Si ix , and Si x . To this end, we have developed a numerical code, which we have applied to investigate the linear polarization and magnetic sensitivity of many permitted EUV lines in a one-dimensional model of the solar corona, providing a list of the most promising lines to be further investigated for polarimetry with future space telescopes. Our next step will be to extend this work by using state-of-the-art three-dimensional coronal models.https://doi.org/10.3847/1538-4357/addc61Solar coronaExtreme ultraviolet astronomySpectropolarimetry |
| spellingShingle | Nataliia G. Shchukina Javier Trujillo Bueno Supriya Hebbur Dayananda Rafael Manso Sainz Andrii V. Sukhorukov Coronal Magnetometry with EUV Permitted Lines The Astrophysical Journal Solar corona Extreme ultraviolet astronomy Spectropolarimetry |
| title | Coronal Magnetometry with EUV Permitted Lines |
| title_full | Coronal Magnetometry with EUV Permitted Lines |
| title_fullStr | Coronal Magnetometry with EUV Permitted Lines |
| title_full_unstemmed | Coronal Magnetometry with EUV Permitted Lines |
| title_short | Coronal Magnetometry with EUV Permitted Lines |
| title_sort | coronal magnetometry with euv permitted lines |
| topic | Solar corona Extreme ultraviolet astronomy Spectropolarimetry |
| url | https://doi.org/10.3847/1538-4357/addc61 |
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