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Page count: 31

By means of a microwave spectroheliograph, maps were made of the sun which show the disk distribution of solar radio emission at a wavelength of 9.1 cm by means of radioisophotes, or lines of constant brightness temperature. The contour interval, which varies from map to map, is usually about 80,000 K, and is determined after the map is drawn by reference to the measured flux density of the whole sun.