Ratio of EIT full Sun images in Fe XII 195A to Fe IX/X 171A as recorded on 19 September 1997 at 01:00 UT. This line ratio gives an indication of the temperature distribution in the Sun's corona with dark areas being cooler regions and bright areas being hotter. Note the distinctive temperature differences in the numerous magnetic loops and the hot extended regions in the outer corona at both the West and East limb. The coronal holes at the North and South pole clearly show up as "cooler" regions.

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