Al XII line ratios in the Sun
Abstract
Recent calculations of electron impact excitation rates in He-like AlXII are used to derive the theoretical electron temperature and density sensitive emission line ratios G ( = (f + i)/r and R ( = f/i, where f, i, and r are the forbidden 1s21S - 1s2s3S, intercombination 1s21S - 1s2p3P and resonance 1s21S - 1s2p1P transitions, respectively. These ratios are found to be significantly different from earlier calculations, and are in much better agreement with X-ray spectral data for two solar flares obtained with the SMM and P78-1 satellites.
- Publication:
-
Solar Physics
- Pub Date:
- February 1987
- DOI:
- 10.1007/BF00167397
- Bibcode:
- 1987SoPh..109...31K
- Keywords:
-
- Electron Energy;
- Electron Impact;
- Electron Transitions;
- Emission Spectra;
- Excitation;
- Solar Flares;
- Electron Density (Concentration);
- Ground State;
- Line Spectra;
- Solar Activity;
- Solar Maximum Mission;
- X Ray Spectra;
- Solar Physics;
- Flare;
- Solar Phys;
- Solar Flare;
- Radiative Recombination;
- Atomic Data