The effect of metastable level populations on the ionization fraction of Li-like ions

Details The effect of metastable level populations on the ionization fraction of Li-like ions The effect of metastable level populations on the ionization fraction of Li-like ions

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...430l..29d&link_type=abstract

Astronomy and Astrophysics, v.430, p.L29-L32 (2005)

Astronomy and Astrophysics

Astrophysics

8

Sun: Atmosphere, Di-Electronic Recombination, Metastable Levels, Contributon Function, Electron Density, Line Intensity, Uv/Euv Radiation

Scientific paper

Lines from Li-like ions have been known to produce theoretical intensities under-estimated compared to lines of a similar formation temperature. Here we investigate this anomalous behaviour whereby the ionization fractions are calculated using the ADAS code considering the electron density dependence of dielectronic recombination coupled with collisional ionization from metastable levels. For the lines investigated, the line contribution functions show a clear dependence with increasing electron density. For example, C IV 1548 Å shows over a factor of three enhancement for Ne = 1012 cm-3. The increase in the higher temperature lines is lower, but are still in the range of 30 to 60%. Furthermore, all the lines have their peak contribution shifted to lower temperature. Calculating the total radiative power output at an electron density of 1011 cm-3, we find that the difference in the transition region is 10-15% while above 106 K the difference is around 30% compared to the low density value.

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