Al xii line ratios in the Sun |
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| Authors: | F P Keenan S M McCann |
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| Institution: | 1. Department of Pure and Applied Physics, The Queen's University of Belfast, BT7 1NN, Belfast, N. Ireland
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| Abstract: | Recent calculations of electron impact excitation rates in He-like Alxii are used to derive the theoretical electron temperature and density sensitive emission line ratios G ( = (f + i)/r and R ( = f/i, where f, i, and r are the forbidden 1s 2 1 S ? 1s2s 3 S, intercombination 1s 2 1 S ? 1s2p 3 P and resonance 1s 2 1 S ? 1s2p 1 P transitions, respectively. These ratios are found to be significantly different from earlier calculations, and are in much better agreement with X-ray spectral data for two solar flares obtained with the SMM and P78-1 satellites. |
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