The Fe XII 195.1 A/1242 A emission line ratio in the solar corona

Details The Fe XII 195.1 A/1242 A emission line ratio in the solar corona The Fe XII 195.1 A/1242 A emission line ratio in the solar corona

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..125...61k&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 125, Jan. 1990, p. 61-65. Research supported by SERC.

Physics

9

Emission Spectra, Solar Corona, Solar Spectra, Ultraviolet Spectra, Iron, Line Spectra, Plasma Diagnostics

Scientific paper

Recent R-matrix calculations of electron impact excitation rates in Fe XII are used to derive the theoretical emission line ratio R1 = I(195.1 A)/I(1242 A), which is potentially a useful electron density diagnostic for the solar inner corona. These results are found to be significantly different from the earlier estimates of Withbroe and Raymond (184), but are in good agreement with the observed values of R1 for the quiet sun and an active region. Adoption of the R-matrix atomic data for the 1242 A line in the coronal iron abundance determination removes an existing discrepancy between results derived from the EUV transition and other iron lines in the solar XUV spectrum.

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