A comparison of theoretical O iii line strengths with XUV solar observations from the S082A instrument on board Skylab |
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| Authors: | F P Keenan S M McCann K M Aggarwal K G Widing |
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| Institution: | (1) Department of Pure and Applied Physics, The Queen's University of Belfast, BT 7 1NN Belfast, N. Ireland;(2) Department of Physics and Astrophysics, The University of Delhi, 110007 Delhi, India;(3) E. O. Hulbert Center for Space Research, Naval Research Laboratory, 20375 Washington DC, U.S.A. |
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| Abstract: | Relative level populations in Oiii, determined using R-matrix calculations of electron impact excitation rates, are used to derive the theoretical emission line ratios R
1 = I(525.80 Å)/I(599.62 Å), R
2 = I(507.41 Å)/I(599.62 Å), R
3 = I(507.71 Å)/I(599.62 Å), and R
4 = I(508.18 Å)/I(599.62 Å). Electron temperatures deduced from the observed values of these ratios for several solar features obtained with the NRL S082A slitless spectrograph on board Skylab are in good agreement, and also compare favourably with that of maximum Oiii fractional abundance in ionisation equilibrium, logT
max = 4.96. These results provide experimental support for the accuracy of the atomic data adopted in the line ratio calculations. |
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