Impact of MHD turbulence on the ionic composition of solar and stellar coronae
- Lomazzi, Paul
- Réville, Victor
- Rouillard, Alexis
- Petit, Pascal
DOIAbstract
Spectroscopic observations of the solar atmosphere reveal regions of the solar corona that are enriched in the abundance of heavy element with low-first ionisation potential (examples of low ‘FIP’ i.e. with <10 eV are Fe, Mg) relative to photospheric abundances. This enhancement in the abundance of low-FIP elements by a factor of three or four, called the ‘FIP effect’, is still not well understood. Moreover enriched abundances of low-FIP elements are also observed in the slow solar wind, which could give us more insights on its origins. An inverse-FIP effect corresponding to a decreased abundance of low-FIP elements has been measured in the atmosphere of M-type stars. Turbulent mixing of the chromosphere combined with the ponderomotive forc...
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