The effect of non-equilibrium ionization on the O VI resonance doublet lines originating in the solar wind source regions

Details The effect of non-equilibrium ionization on the O VI resonance doublet lines originating in the solar wind source regions The effect of non-equilibrium ionization on the O VI resonance doublet lines originating in the solar wind source regions

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...281..245s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 281, no. 1, p. 245-248

Astronomy and Astrophysics

Astrophysics

6

Coronal Holes, Ionization, Line Spectra, Oxygen Ions, Plasma Equilibrium, Solar Corona, Solar Wind, Ion Density (Concentration), Magnetohydrodynamic Flow, Stellar Models

Scientific paper

We investigated the effects of the deviations from ionization equilibrium occurring in the plasma outflowing from the solar wind source regions on the intensity and profile of the O VI resonance doublet lines. In particular, we computed the densities of the ions of oxygen along the coronal hole models considered by Spadaro & Ventura (1993, hereafter Paper I), dropping the assumption of ionization equilibrium. These density values were used to calculate the intensity and profile of the O VI lines expected from the coronal structures considered, adopting the same procedure described in Paper I. The results have been compared to those obtained assuming ionization equilibrium. The comparison shows differences which become significant at heliocentric distances larger than 3-4 solar radii. The importance of these results for the analysis of the O VI emission from the solar wind source regions has been discussed.

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