ocr: Ratio of EIT full Sun images in Fe XII 195 A to Fe IX/X 171 A as recorded on 12 May 1996 belween 06:53 and 06:59 UT This line ratio gives an indication of the remperature distribution in the Sun's corona with dark areas being cooler regions and bright areas being hotter. The coronal holes af the North and South pole clearly show up as cooler" regions.
