2008/06/17 by A. E. E. Rogers, Alan E. E. Rogers, Judd D. Bowman · 5 citations
Engineering · Physics and Astronomy · #Astronomy #Computer science #Index (typography) #Millimeter-Wave Propagation and Modeling #Physics #Radio Astronomy Observations and Technology #Radio Wave Propagation Studies #Radio spectrum #Spectral index #Spectral line #World Wide Web #astro-ph
paper · pdf · doi:10.1088/0004-6256/136/2/641
8 pages including 7 figures and 4 tables. Accepted by AJ
arxiv created 2008/06/17 · openalex publication_date 2008/07/04 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The mean absolute brightness temperature of the diffuse radio background was measured as a function of frequency in a continuous band between 100 and 200 MHz over an effective solid angle of ∼π sr at high Galactic latitude. A spectral brightness temperature index of β = 2.5 ± 0.1 (α S = 0.5) was derived from the observations, where the error limits are 3σ and include estimates of the instrumental systematics. Zenith drift scans with central declination δ = −26.5° and spanning right ascensions 0 < α < 10 h yielded little variation in the mean spectral index. The mean absolute brightness temperature at ν = 150 MHz was found to reach a minimum of T = 237 ± 10 K at α = 2.5 h. Combining these measurements with those of Haslam et al. yields a spectral index of β = 2.52 ± 0.04 between 150 < ν < 408 MHz.