The Spectrum of the Cosmic Radio Background Between 0.4 and 6.5 MHz Alexander, J. K. ; Brown, L. W. ; Clark, T. A. ; Stone, R. G. ; Weber, R. R. Abstract Publication: The Astrophysical Journal Pub Date: September 1969 DOI: 10.1086/180411 Bibcode: 1969ApJ...157L.163A