Physics
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..92..223c&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 92, no. 1, May 1983, p. 223-227.
Physics
Electron Density (Concentration), Forbidden Transitions, Optical Thickness, Solar Atmosphere, Solar Corona, Solar Spectra, Electron Energy, Extremum Values, Line Spectra, Metastable State, Radiative Transfer, Solar Physics
Scientific paper
Solar-atmosphere electron density is estimated by analysis of the forbidden 975-3000-A spectral lines in the ground state configuration of Mg(VI), Mg(VII), Si(VII), Si(VIII), Si(IX), S(IX), S(X), and Ar(XI) in two regions (4 arcsec above AR 12114 and 40 arcsec above AR 12300). The calculations are based on the solution by standard matrix techniques of sets of statistical-equilibrium equations which are linear for the optically thin forbidden lines. Critical electron density lifetime, probable transition, wavelength, and the presence of the forbidden line in the regions observed by Sandlin et al. (1977) are given for each line. The results are found to indicate an approximate upper limit of electron density in the two regions of about 2 x 10 to the 8th per cu cm. This approach is considered more accurate than the method of line-intensity ratios.
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