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Al xii line ratios in the Sun

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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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Authors and Affiliations

  1. Department of Pure and Applied Physics, The Queen's University of Belfast, BT7 1NN, Belfast, N. Ireland

    F. P. Keenan & S. M. McCann

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  1. F. P. Keenan
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  2. S. M. McCann
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Keenan, F.P., McCann, S.M. Al xii line ratios in the Sun. Sol Phys 109, 31–35 (1987). https://doi.org/10.1007/BF00167397

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  • DOI: https://doi.org/10.1007/BF00167397

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