Element segregation in the solar chromosphere and the FIP bias: the "Skimmer" model.

Details Element segregation in the solar chromosphere and the FIP bias: the "Skimmer" model. Element segregation in the solar chromosphere and the FIP bias: the "Skimmer" model.

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...308..228v&link_type=abstract

Astronomy and Astrophysics, v.308, p.228-232

Astronomy and Astrophysics

Astrophysics

12

Sun: Abundances, Chromosphere, Magnetic Fields, Diffusion

Scientific paper

A new approach of the segregation between high-Fip (First ionisation potential) and low-Fip elements in the solar chromospheric plateau is proposed. Magnetic fields emerging from the photosphere up to the chromosphere and corona can lift up enough low-Fip elements to explain locally their observed overabundances. While the magnetic field rises in this partially ionised medium, the electrons become trapped along the rising magnetic lines. Protons and ionised heavy (low-Fip) elements follow due to the induced electric field. The whole bulk of chromospheric gas is eventually brought up due to collisions and charge-exchange processes. The time delay between the motion of the ionised atoms and the motion of the whole gas is however sufficient for ions to accumulate in a small frontward layer, in which the chemical composition becomes of "coronal type" namely with an overabundance of low-Fip elements. Local overabundances of low-Fip elements are obtained without any mass bias and within short enough time scales. Helium is expected to be slightly depleted compared to hydrogen as observed. We present here preliminary computations using the homogeneous and static chromospheric models of Vernazza, Avrett and Loeser 1981. Complete dynamical models should be studied in the future, according to the various coronal sites. The present results seem promising enough to motivate further computations.

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