Relatore
Descrizione
The chemical composition of solar plasma remains largely unchanged as it travels along open magnetic fields from the chromosphere and corona into the heliosphere. While the solar corona is expected to have a chemical composition similar to the solar photosphere, it often exhibits a peculiar enrichment of elements with low First Ionization Potential (FIP), the so-called FIP effect. Understanding the mechanism of this fractionation is crucial for many reasons, including recostructing the origin of the solar wind.
In this talk, I will present recent breakthroughs in identifying the physical driver of this phenomenon. By combining high-resolution spectropolarimetric high-resolution spectropolarimetric ground-based observations from the IBIS instrument with EUV spectroscopic data from the HINODE/EIS mission, we provide the first direct evidence of a magnetic link between chromospheric wave reflection and coronal FIP fractionation. Our analysis allows us to disentangle upward and downward propagating waves, confirming the presence of wave reflection within the chromosphere. These findings provide a robust observational validation of theoretical models involving the ponderomotive force.
| Sessione | Eliofisica e Space Weather |
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