Multi-fluid multi-species models for inverse FIP-effect
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866914469525848064 |
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| author | Martínez-Sykora, Juan Testa, Paola Baker, Deborah De Pontieu, Bart |
| author_facet | Martínez-Sykora, Juan Testa, Paola Baker, Deborah De Pontieu, Bart |
| contents | The inverse First Ionization Potential (FIP) effect is rarely observed in the solar atmosphere, and this anomaly poses a challenging problem in understanding physical processes driving this chemical fractionation. In this work, we investigate various scenarios where the inverse FIP effect could occur using simplified 1D multi-fluid MHD models. The model treats the full MHD equations with multi-fluid and multi-species effects, rather than using wave analysis to derive the ponderomotive force and semi-empirical 1D models. In the parametric study considered here, for upward Alfvén waves, one can achieve a negative (opposite) ponderomotive force when the magnetic field strength and the magnetic flux tubes' expansion with height counteract the dissipation and damping effects from multi-fluid interactions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_11647 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Multi-fluid multi-species models for inverse FIP-effect Martínez-Sykora, Juan Testa, Paola Baker, Deborah De Pontieu, Bart Solar and Stellar Astrophysics The inverse First Ionization Potential (FIP) effect is rarely observed in the solar atmosphere, and this anomaly poses a challenging problem in understanding physical processes driving this chemical fractionation. In this work, we investigate various scenarios where the inverse FIP effect could occur using simplified 1D multi-fluid MHD models. The model treats the full MHD equations with multi-fluid and multi-species effects, rather than using wave analysis to derive the ponderomotive force and semi-empirical 1D models. In the parametric study considered here, for upward Alfvén waves, one can achieve a negative (opposite) ponderomotive force when the magnetic field strength and the magnetic flux tubes' expansion with height counteract the dissipation and damping effects from multi-fluid interactions. |
| title | Multi-fluid multi-species models for inverse FIP-effect |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2604.11647 |