Physics
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...92...75k&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 92, May 1984, p. 75-79. Research supported by the Science and Engineering Research Council.
Physics
28
Emission Spectra, Line Spectra, Oxygen Spectra, Plasma Spectra, Rarefied Plasmas, Collision Parameters, Electron Energy, Electron Scattering, Recombination Coefficient, Spectral Line Width
Scientific paper
New electron excitation rates for O VII calculated by Tayal and Kingston (1984) using the R-matrix method are used to determine theoretical emission line strengths. Values of the electron density sensitive ratio R (forbidden line to intercombination line) are found to be very similar to those deduced by other authors. However, the temperature sensitive ratios G (intercombination plus forbidden lines to resonance line) are approximately 20 percent lower than the best previous estimates. The observed values of G for solar active regions (G = 1.0 + or - 0.1) predicts an electron temperature in the range (1.1-1.8) x 10 to the 6th K, which overlaps that of maximum O VII emissivity, 10 to the 6th K. In addition, the theoretical G versus Te curve is in excellent agreement with that observed for a Tokamak plasma.
Keenan Francis P.
Kingston A. E.
Tayal Swaraj S.
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