Al xii line ratios in the Sun |
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Authors: | F P Keenan and 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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Keywords: | |
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