The effect of non-equilibrium ionization on the H I Lyman-α line originating in the solar wind source regions.
Abstract
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 H I Lyman-α line. In particular, we computed the densities of the ions of Hydrogen along a coronal hole model, with and without the assumption of ionization equilibrium. Analogously, we computed the ion densities in the unstructured quiet corona surrounding the coronal hole. These density values were used to calculate the intensity and profile of the Lyman-α line expected from the coronal structures considered, both in equilibrium and non-equilibrium conditions. The comparison between non-equilibrium and equilibrium results shows only some differences at heliocentric distances higher than 5 Rsun_. The importance of these results for the analysis of the Lyman-α emission from the solar wind source regions has been discussed.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- September 1994
- Bibcode:
- 1994A&A...289..279S
- Keywords:
-
- Hydrogen Ions;
- Lyman Alpha Radiation;
- Lyman Spectra;
- Nonequilibrium Ionization;
- Solar Corona;
- Solar Spectra;
- Solar Wind;
- Plasma Temperature;
- Radiant Flux Density;
- Spectral Energy Distribution;
- Spectrum Analysis;
- Solar Physics;
- SUN: CORONA;
- SUN: SOLAR WIND;
- SUN: UV RADIATION