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Investigation of non-uniform heating during the decay phase of solar flares

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Abstract

We have analysed X-ray spectra of 13 solar flares as obtained by the Bent Crystal Spectrometer (BCS) on the Solar Maximum Mission. In particular, we have examined the observed ratio of T Fe/T Ca where T Fe and T Ca are the temperatures obtained from the Fexxv and Caxix spectra, respectively. In order to simplify the investigation we have analysed only flares which reach quasi-steady-state during the decay. It turned out that the observed ratios cannot be explained by a model consisting of a single, uniformly heated loop, with a constant or variable cross-sectional area. We propose that this problem may be solved by introducing some distribution of the heating function across the flaring loop. This model has been tested by detailed calculations.

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Authors and Affiliations

  1. Space Research Center of Polish Academy of Sciences, Wrocŀaw, Poland

    B. Sylwester & J. Sylwester

  2. Mullard Space Science Laboratory, Holmbury St. Mary, Dorking, Surrey, England

    R. D. Bentley & A. Fludra

Authors
  1. B. Sylwester
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  2. J. Sylwester
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  3. R. D. Bentley
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  4. A. Fludra
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Sylwester, B., Sylwester, J., Bentley, R.D. et al. Investigation of non-uniform heating during the decay phase of solar flares. Sol Phys 126, 177–184 (1990). https://doi.org/10.1007/BF00158305

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  • DOI: https://doi.org/10.1007/BF00158305

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