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[en] Coronal holes have been observed on several occasions with the 80 and 160 MHz radioheliograph at Culgoora. At 160 MHz the holes invariably appear as areas of low brightness, either on the disk or at the limb. At 80 MHz holes on the limb always appear less bright than their surroundings but on the disk they frequently appear brighter. The simplest interpretation is that the coronal temperature in holes near the 80 MHz critical density (8 X 107 cm-3) is higher than in normal quiet regions, but that the density at this level is lower. (Auth.)
Source
Dryer, M. (National Oceanic and Atmospheric Administration, Boulder, CO (USA). Space Environment Lab.); Tandberg-Hanssen, E. (National Aeronautics and Space Administration, Huntsville, AL (USA). George C. Marshall Space Flight Center) (eds.); International Council of Scientific Unions. Special Committee on Solar-Terrestrial Physics; Committee on Space Research. (COSPAR), 75-Paris (France); 577 p; ISBN 90-277-1163-1; 
; 1980; p. 37-43; D. Reidel; Dordrecht, Netherlands; International Astronomical Union symposium no. 91 on solar and interplanetary dynamics; Cambridge, MA, USA; 27 - 31 Aug 1979
; 1980; p. 37-43; D. Reidel; Dordrecht, Netherlands; International Astronomical Union symposium no. 91 on solar and interplanetary dynamics; Cambridge, MA, USA; 27 - 31 Aug 1979