An analysis is presented of X-ray line emission from heliumlike calcium and related satellite lines produced by the large flare of 1969 November 2. The data were obtained from an NRL Bragg crystal spectrometer aboard OSO-6. The inner-shell transition of Ca+17, 1s22s 2S-ls2s2p P, and the forbidden transition of Ca+58, 1s2 5S-ls2s S, are clearly resolved. The intercombination line of Ca+58 is numerically separated into contributions from the 2 i and 2 3p2 levels. Time histories of the flux of the resonance (1s 58-1s2p ii)), intercombination (lsi 5S-1s2p 3p), and forbidden (1s2 53-ls2s 25) lines of Ca+15, and the inner-shell K-line of Ca+17 (1s22s 2S-1s2s2p ip), indicate that recombination is an important process for line formation under flare conditions. For the November 2 event, no statistically significant changes in the ratio of the forbidden to intercombination lines occurred during the time interval of observation.
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Doschek et al. (1971) studied this question.