The Interpretation of Total Line Intensities from Optically Thin Gases. III: Application to Coronal Forbidden Line Spectra
Abstract
The diagnostic method developed in the two preceding papers of this series is applied to coronal forbidden line intensity data obtained at eclipses in 1952, 1961, 1965, 1966, and 1970. The application of the method is limited by the nature of the data but allows a first inference of the relationship between electron density and temperature in the condensations observed at these eclipses, and of the distribution of the electrons within the temperature range samples by the observations effectively 106 to 2.4 × 106 K. We determine the relative abundance of nickel to iron in the corona, finding a value in agreement with latest photospheric determinations and with a similar (factor of two) uncertainty. We are also able to set lower limits to the abundance of iron with respect to hydrogen, again finding values consistent with recent photospheric determinations.
- Publication:
-
Solar Physics
- Pub Date:
- February 1972
- DOI:
- 10.1007/BF00148700
- Bibcode:
- 1972SoPh...22..327J
- Keywords:
-
- Hydrogen;
- Iron;
- Nickel;
- Relative Abundance;
- Lower Limit