The results of calculations of the 0.5-70 A X-ray spectrum of a high-temperature, low-density plasma are presented. The temperature range is 6 X 10 10 K, and the elemental abundances characteristic of the solar corona have been assumed. We have considered the processes of line emission following electron collisional excitation, radiation resulting from recombination, bremostrablung, and two-photon decay following the excitation of the metastable 2S state in hydrogenic and helium4ike ions.
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Tucker et al. (1971) studied this question.