Effects of density on the oxygen ionisation equilibrium in collisional plasmas

Abstract

The ion populations most frequently adopted for diagnostics in collisional plasmas are derived from the density independent, coronal approximation. In higher density, lower temperature conditions, ionisation rates are enhanced once metastable levels become populated, and recombination rates are suppressed if ions recombine into Rydberg levels. As a result, the formation temperatures of ions shift, altering the diagnostics of the plasma. To accurately model the effect of ionisation from metastable levels, new electron impact, ionisation cross sections have been calculated for oxygen, both for direct ionisation and excitation--auto-ionisation of the ground and metastable levels. The results have been incorporated into collisional radiative modelling to show how the ionisation equilibrium of oxygen changes once metastable levels become populated. Suppression of dielectronic recombination has been estimated and also included in the modelling, demonstrating the shifts with density in comparison to the coronal approximation. The final results for the ionisation equilibrium are used in differential emission measure modelling to predict line intensities for many lines emitted by O II-VI in the solar transition region. The predictions show improved agreement by 15-40% for O II, O VI and the inter-combination lines of O III-V, when compared to results from coronal approximation modelling. While there are still discrepancies with observations of these lines, this could, to a large part, be explained by variability in the observations.

15 pages, 11 figures, accepted by MNRAS

References in corpus (4)

• CHIANTI - an atomic database for emission lines - Paper XV: Version 9, improvements for the X-ray satellite lines
• Radiative recombination data for modelling dynamic finite-density plasmas
• Modelling ion populations in astrophysical plasmas: carbon in the solar transition region
• R-matrix electron-impact excitation data for the C-like iso-electronic sequence

Cited by in corpus (9)

• CHIANTI -- an atomic database for emission lines -- Paper XVI: Version 10, further extensions
• Linking the Sun to the Heliosphere Using Composition Data and Modelling. A Test Case with a Coronal Jet
• Modelling low charge ions in the solar atmosphere
• Photoionization Models for High Density Gas
• Scientific Objectives of the Hot Universe Baryon Surveyor (HUBS) Mission
• The influence of photo-induced processes and charge transfer on carbon and oxygen in the lower solar atmosphere
• A benchmark study of atomic models for the transition region against quiet Sun observations
• R-matrix electron-impact excitation data for the H- and He-like ions with Z=6-30
• CHIANTI -- an atomic database for emission lines -- Paper XVIII. Version 11, advanced ionization equilibrium models: density and charge transfer effects