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S vi line ratios in the Sun

Authors:	F P Keenan

Institution:	(1) Department of Pure and Applied Physics, the Queen's University of Belfast, BT7 1NN Belfast, N. Ireland

Abstract:	R-matrix calculations of electron impact excitation rates in S vi are used to determine the theoretical temperature sensitive emission line ratios $R1 = I(3d^2 D3/2,5/2 - 3p^2 P3/2)/I(3p^2 P1/2 - 3s^2 S1/2) = I(712.8{\AA})/I(944.5{\AA})$ and $R1 = I(3d^2 D3/2,5/2 - 3p^2 P3/2)/I(3p^2 P1/2 - 3s^2 S1/2) = I(712.8{\AA})/I(933.4{\AA}),$ which are found to be up to 30% larger than the earlier results of Flower and Nussbaumer. A comparison of the present data with solar observations from the Harvard S-055 spectrometer on board Skylab implies that the 944.5 Å transition may be blended with lines from species with relatively low ionization potentials, in contrast to the findings of Flower and Nussbaumer. The 712.8 Å transition may also be similarly blended.

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