AR XIII line ratios in solar flares

Details AR XIII line ratios in solar flares AR XIII line ratios in solar flares

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993soph..145..291k&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 145, no. 2, p. 291-296.

Physics

9

Electron Density (Concentration), Electron Energy, Emission Spectra, Solar Flares, Argon, Electron Transitions, Spectral Bands, Spectroheliographs

Scientific paper

Theoretical Ar XIII electron-density-sensitive emission line ratios, derived using electron impact excitation rates interpolated from accurate R-matrix calculations, are presented for R1 = I/(242.22 A)/I(236.27 A), R2 = I(210.46 A)/I(236.27 A), and R3 = I/(248.68 A)/I(236.27 A). Electron densities deduced from the observed values of R1, R2, and R3 for solar flares obtained with the NRL S082A slitless spectrograph on board Skylab are in excellent agreement, and furthermore compare favorably with those determined from line ratios in Ca XV, which is formed at a similar electron temperature to that of Ar XIII. These results provide experimental support for the accuracy of the atomic data adopted in the analysis, as well as for the techniques used to calculate the line ratios.

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