Observational evidence points to the chromosphere as the site of chemical fractionation responsible for the FIP effect in the solar corona.
2009 Non-Wkb Models of the First Ionization Potential Effect: Implications for Solar Coronal Heating and the Coronal Helium and Neon Abundances.ApJ695, 954–969
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The connection between solar coronal abundances and the underlying lower atmospheric properties
Observational evidence points to the chromosphere as the site of chemical fractionation responsible for the FIP effect in the solar corona.