Theoretical Ne ix line ratios compared to solar observations
Abstract
R-matrix calculations of the 11S - 23S and 11S - 23P electron excitation rates in He - like CV, OVII, and MgXI by Kingston and Tayal are used to interpolate results for NeIX. Adoption of these in emission line strength calculations leads to values for the density-sensitiveR ratio very similar to those of Pradhanet al. and Wolfsonet al., although the temperature-sensitiveG ratios are approximately 10 to 20 % lower than those deduced by these authors. However the present theoretical value ofG at the temperature of maximum NeIX emission,G(Tm) = 0.82, is in excellent agreement with those observed by the SMM and P78-1 satellites for the 1980, November5 flare (G = 0.83 ± 0.01) and nonflaring active regions (G = 0.80 ± 0.05), respectively.
- Publication:
-
Solar Physics
- Pub Date:
- August 1984
- DOI:
- 10.1007/BF00154809
- Bibcode:
- 1984SoPh...94...85K
- Keywords:
-
- Electron Transitions;
- Line Spectra;
- Neon;
- Solar Spectra;
- Collision Rates;
- Electron Density (Concentration);
- Electron Energy;
- Electron Impact;
- Excitation;
- Plasma Diagnostics;
- Solar Physics;
- Flare;
- Active Region;
- Excellent Agreement;
- Emission Line;
- Electron Excitation