First ionization potential fractionation

Details First ionization potential fractionation First ionization potential fractionation

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.348..325h&link_type=abstract

In ESA, Proceedings of the First SOHO Workshop: Coronal Streamers, Coronal Loops, and Coronal and Solar Wind Composition p 325-3

Astronomy and Astrophysics

Astronomy

14

Fractionation, Ionization Potentials, Photosphere, Solar Activity, Abundance, Astronomical Models, Electric Fields, Magnetic Fields, Mathematical Models, Neutral Sheets

Scientific paper

The existing models of FIP (First Ionization Potential) fractionation are reviewed. The main characteristics of the observed abundance anomalies that must be taken into account by FIP fractionation models are recalled. Two main models, based on ion neutral separation in a magnetic field and which differ fundamentally by the nature of the particles (neutrals or ions) that cross the lines of force under the constraint of pressure or electric forces, are presented. A qualitative model of FIP fractionation based on a quantitative estimate of the characteristics of DC currents generated into magnetic flux tubes and of their mechanical effects is addressed. As discussed in the conclusion, FIP fractionation appears as a natural consequence of the circulation of currents in magnetic flux tubes and it can be associated with the formation of the solar chromosphere.

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