Abstract
A Bragg Crystal spectrometer is one of the instruments on the Solar-A mission. Using bent crystals, the spectrometer will observe the resonance line complexes of the H-like Fe XXVI, and He-like Fe XXV and Ca XIX ions with a sensitivity 5 to 10 times that of the SMM Bent Crystal Spectrometer. It will also study the lower temperature lines of He-like S XV. The improved sensitivity will allow observations much earlier in the impulsive phase of flares than has previously been possible. The new observations should help to answer questions about plasma heating and dynamics. As well as providing information on line profiles and shifts, the selected spectral lines will also provide electron temperature and emission measure estimates over a range from 5 to 50 MK. The onboard microprocessor will permit spectral resolution to be traded against time resolution during an observation.
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