Investigation of non-uniform heating during the decay phase of solar flares |
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Authors: | B Sylwester J Sylwester R D Bentley A Fludra |
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Institution: | (1) Space Research Center of Polish Academy of Sciences, Wrocaw, Poland;(2) Mullard Space Science Laboratory, Holmbury St. Mary, Dorking, Surrey, England |
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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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