Varying Calcium Abundances in Solar Flares Seen by the Solar Maximum Mission by B. Sylwester, J. Sylwester, K. J. H. Phillips, A. Kępa

“…We report on calcium abundance A (Ca) estimates during the decay phases of 194 solar X-ray flares using archived data from the Bent Crystal Spectrometer (BCS) on the Solar Maximum Mission (operational 1980–1989). The abundances are derived from the ratio of the total calcium X-ray line emission in BCS channel 1 to that in neighboring continuum, with temperature from a satellite-to-resonance line ratio. …”
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