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The large-scale structure of the solar corona is investigated using synoptic maps produced from Fe XIV (530.3 nm), Fe X (637.4 nm) and Ca XV (569.4 nm) data obtained at NSO/SP, Yohkoh/SXT X-ray data and Wilcox Solar Observatory (WSO) source surface maps. We find that the Fe XIV data are an excellent proxy for spatially-averaged Yohkoh/SXT data. Isolated emission features and large-scale structures...
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