Insights into penumbral formation from high-resolution photospheric and chromospheric observations
Context. Penumbra formation occurs within hours and remains not fully understood. Two competing theories suggest either a top-down mechanism, whereby the chromospheric magnetic field becomes more horizontal, or a bottom-up process involving flux emergence near the sunspot umbra. Aims. We investigate...
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| Principais autores: | , , , |
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| Formato: | Artigo |
| Idioma: | Inglês |
| Publicado em: |
EDP Sciences
2026-01-01
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| coleção: | Astronomy & Astrophysics |
| Assuntos: | |
| Acesso em linha: | https://www.aanda.org/articles/aa/full_html/2026/01/aa56465-25/aa56465-25.html |
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