Abstract
MEASUREMENTS of the low-resolution, low-frequency, radio spectra in the direction of the galactic poles show a significant difference between the two hemispheres. Spectra for the north and south galactic poles are shown in Fig. 1, based on refs. 1–19, and the vertical scales have been displaced to assist comparison. The brightness S as a function of frequency ν between 10 and 150 MHz is well described by 
where the spectral index α has the values α ≃ 0.4 for the north galactic halo, and α ≃ 0.6 for the south galactic halo.
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HAMILTON, P., FRANCEY, R. Synchrotron Emission from the Galaxy and the Diffuse X-ray Background. Nature 224, 1090–1093 (1969). https://doi.org/10.1038/2241090a0
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DOI: https://doi.org/10.1038/2241090a0
