Project description
Refining current diagnostic techniques to map the solar magnetic field
Uncovering the structure of the Sun's magnetic field is vital for understanding solar activity and space weather. As direct measurements are unfeasible, we develop remote sensing techniques exploiting the fingerprints that magnetic fields leave in the polarisation of solar light. The CLASP2/2.1 missions show that ultraviolet spectropolarimetry in the MgII h&k lines effectively maps the magnetic field stratification in the upper chromosphere. These missions also indicate that nearby lines carry information from deeper regions, but limited theoretical modelling restricts their diagnostic capability. Supported by the Marie Skłodowska-Curie Actions programme, the SOMMA project will fully unveil the diagnostic value of these lines, enabling more accurate inferences of the magnetic field stratification across various atmospheric layers from both existing and future observational data.
Objective
Understanding the magnetic field stratification throughout the solar atmosphere is imperative for characterizing the origin of solar activity and the physical processes that drive space weather. However, due to the impossibility of performing direct measurements, diagnosing the solar magnetic field remains a complex challenge, requiring continuous advancements in both observational techniques and theoretical modeling.
The polarization of spectral lines formed in the solar atmosphere carries the imprint of the magnetic field via the Zeeman and Hanle effects. By analyzing their signatures on spectropolarimetric signals, it is possible to infer information about the magnetic field across different layers of the solar atmosphere.
Recently, the CLASP2 and CLASP2.1 suborbital missions have demonstrated the diagnostic potential of ultraviolet spectropolarimetry for probing chromospheric magnetism. Their unprecedented observations enabled the most detailed mapping to date of the magnetic field stratification in active regions, while also validating the use of the Hanle effect to detect weak magnetic fields in quiet-Sun areas.
The spectral window observed by the CLASP experiments includes the strong Mg II h & k resonance lines, whose cores encode information on the upper solar chromosphere, and several other weaker spectral lines. The polarization signals of these weaker lines carry complementary information on the magnetism of lower atmospheric regions, offering a unique opportunity to study magnetic coupling from the photosphere to the transition region. Regrettably, theoretical modeling of these lines has received little attention, limiting the exploitation of this spectral window’s diagnostic potential. This project aims to overcome this by improving our understanding of the formation of intensity and polarization signals in these lines. This will refine current diagnostic techniques and enable more accurate inferences of magnetic field from existing and future data.
Fields of science (EuroSciVoc)
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CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
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Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Programme(s)
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
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HORIZON.1.2 - Marie Skłodowska-Curie Actions (MSCA)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European Fellowships
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(opens in new window) HORIZON-MSCA-2025-PF
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Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.
6605 LOCARNO MONTI
Switzerland
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