MG VII and SI IX line ratios in the sun

Details MG VII and SI IX line ratios in the sun MG VII and SI IX line ratios in the sun

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986soph..103..225k&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 103, no. 2, 1986, p. 225-230. SERC-supported research.

Physics

19

Line Spectra, Magnesium, Silicon, Solar Spectra, Atomic Excitations, Electron Density (Concentration), Solar Flares

Scientific paper

Recent R-matrix calculations of electron excitation rates for Mg VII and Si IX are used to determine the theoretical density sensitive emission line ratios R1 and R2. These are found to be quite similar to the earlier results of Mason and Bhatia. Electron densities derived using observed R1 and R2 ratios from Skylab NRL XUV spectra of solar flares and active regions are in good agreement, and compare favourably with those deduced from ions formed at similar electron temperatures to Mg VII and Si IX.

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