Fe XVI line ratios in the Sun

Details Fe XVI line ratios in the Sun Fe XVI line ratios in the Sun

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...432..809k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 432, no. 2, p. 809-811

Astronomy and Astrophysics

Astrophysics

9

Atomic Excitations, Electron Energy, Electron Impact, Iron, Line Spectra, Ratios, Solar Flares, Sodium, Solar Corona

Scientific paper

Recent R-matrix calculations of electron impact excitation rates in Fe XVI are used to derive the emission-line ratios R1 = I(251.07 A)/I(335.40 A), R2 = I(262.98 A)/I(335.40 A), and R3 = I(265.00 A)/I(335.40 A). A comparison of these with solar observational data obtained by the Naval Research Laboratory's S082A slitless spectrograph on board Skylab reveals generally good agreement between theory and observation, which provides experimental support for the accuracy of the atomic data adopted in the analysis. However, several of the measured ratios are much larger than theory predicts, which is probably due to saturation of the strong 335.40 A line on the photographic film used to record the S082A data. The potential usefulness of R1, R2, and R3 as electron temperature diagnostics for the solar corona is briefly discussed.

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