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The mean absolute brightness temperature of the diffuse radio background wasmeasured as a function of frequency in a continuous band between 100 and 200MHz over an effective solid angle of ~pi str at high Galactic latitude. Aspectral brightness temperature index of beta = 2.5 +/- 0.1 (alpha_s = 0.5) wasderived from the observations, where the error limits are 3-sigma and includeestimates of the instrumental systematics. Zenith drift scans with centraldeclinations of -26.5 degrees and spanning right ascensions 0 to 10 hoursyielded little variation in the mean spectral index. The mean absolutebrightness temperature at 150 MHz was found to reach a minimum of T = 237 +/-10 K at a right ascension of 2.5 hours. Combining these measurements with thoseof Haslam et al. 1982 yields a spectral index of beta = 2.52 +/- 0.04 between150 and 408 MHz.

Spectral Index of the Diffuse Radio Background Measured From 100 to 200 MHz