Title: | INFLUENCE OF YOHKOH BCS INSTRUMENTAL SHAPE ON RESULTS OF SPECTRAL FITTING IN VICINITY OF Ca XIX LINES | |
Authors: | A. Kepa and J. Sylwester | |
Abstract: | The analysis of Ca XIX helium-like ion soft X-ray spectra in vicinity of the resonance line at l=3.177 [Å] proved to be very useful in determinations of calcium absolute abundances. This spectral region have been extensively investigated using Bragg Crystal Spectrometers aboard the Solar Maximum Mission (SMM) and Yohkoh spacecraft. The analysis of the line-to-continuum intensity ratios yield however conflicting results as concern the average calcium abundance for flares observed by SMM and Yohkoh spectrometers (Bentley, Sylwester and Lemen, 1997). In the present research we investigate the influence of possible uncertainties in the shape of instrumental part of the spectral line profile on derived Yohkoh abundances. We conclude that by increasing the width of Lorentzian component of the instrumental profile it is possible to lessen the mentioned discrepancy. |
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