Abstract

During the 1980’s, very high spectral resolution solar X‐ray spectra were obtained from a number of Bragg crystal spectrometer experiments on orbiting spacecraft. Taken together, these instruments covered the solar X‐ray spectrum from about 1.8 A up to about 25 A. Inner‐shell transitions in highly ionized ions were observed for several solar abundant elements, such as iron and calcium. Most of the spectra were obtained from solar flare plasmas at temperatures of about 1–3.5 keV. It was possible to study the time‐behavior of line intensities and line profiles for all phases of a solar flare. From these spectra, the accuracy of certain atomic physics calculations can be determined, and parameters in the solar flare plasma such as electron temperature and density can be measured.The most significant results from these space missions are reviewed, and a new Bragg crystal spectrometer experiment is described. The solar spectra will also be related to some recent laboratory measurements involving tokamak spectr...

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