Mathematics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..128..345k&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 128, Aug. 1990, p. 345-351. Research supported by SERC and Department of Education of North
Mathematics
6
Emission Spectra, Extreme Ultraviolet Radiation, Solar Spectra, Sunspots, Ultraviolet Spectra, Electron Impact, Fine Structure, Isoelectronic Sequence, Lyman Spectra, Matrices (Mathematics)
Scientific paper
Electron impact excitation rates for transitions in the S V ion, calculated with the R-matrix code, are used to derive the electron temperature-sensitive emission line ratios R1 = I(854.8 A)/I(786.9 A), R2 = I(852.2 A)/I(786.9 A), R3 = I(849.2 A)/I(786.9 A), and R4 = I(1199.1 A)/I(786.9 A), which are found to be significantly different from previous estimates. A comparison of the present results with observational data for a sunspot obtained with the Harvard S-055 spectrometer on board Skylab reveals generally good agreement between theory and experiment, except in the case of R1, which is probably due to blending in the 854.8 A feature. The possible effects of Lyman continuum absorption on the observed line ratios is briefly discussed.
Doyle Gerry J.
Keenan Francis P.
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