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AIix emission line ratios in solar flares observed with the S082A spectrograph on board Skylab

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Abstract

Theoretical electron-density-sensitive emission line ratios in B-like AIix are presented forR =I(385.01 Å)/I(392.42 Å). A comparison of these with high spectral resolution solar flare data, obtained with the S082A slitless spectrograph on boardSkylab, reveals agreement between theory and observation for those spectra that were observed during the later stages of the flares. These results provide experimental support for the accuracy of the line-ratio calculations, and also resolves discrepancies found previously when the theoretical results were compared with solar observations from the S-055 instrument on boardSkylab. However, the agreement between theory and observation for a spectrum obtained during the early stages of a flare is very poor, which probably indicates that the 392.42 Å line is blended with a transition arising from a species formed at a very high electron temperature.

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Authors and Affiliations

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

    F. P. Keenan, E. S. Conlon & D. A. Bowden

  2. Department of Applied Physics, Institute of Technology, Banaras Hindu University, 221 005, Varanasi, India

    B. N. Dwivedi

  3. Code 4174W, E.O. Hulburt Center for Space Research, Naval Research Laboratory, 20375-5000, Washington DC, USA

    K. G. Widing

Authors
  1. F. P. Keenan
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  2. E. S. Conlon
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  3. D. A. Bowden
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  4. B. N. Dwivedi
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  5. K. G. Widing
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Keenan, F.P., Conlon, E.S., Bowden, D.A. et al. AIix emission line ratios in solar flares observed with the S082A spectrograph on board Skylab. Sol Phys 149, 137–142 (1994). https://doi.org/10.1007/BF00645184

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  • DOI: https://doi.org/10.1007/BF00645184

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