Cosmic-noise Survey at 65 (N) Declination in the 5-50 Mc/s Band

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Abstract
Cosmic radio noise intensities at frequencies of 5, 10, 20, 30, and 50 Mc/s were measured at College, Alaska, (65°N) by vertically directed aerials having identical radiation patterns with half-power response at 30° off axis. The 10 and 30 Mc/s temperatures in the direction of the galactic halo are used to derive values of E L , the lower cut-off energy of the electronic component of the cosmic rays. E L is, in turn, used to deduce values for the Fermi parameter, ∊ , on the assumption that the Fermi process acts in the galactic disk. The influence on ∊ of the uncertainties in ( a ) the mean perpendicular component of the disk field, ( b ) the average density of matter in the disk, and ( c ) the value of the halo field is tested with various combinations of values for these parameters. The values of e so obtained are approximately confined to the range 10 −16 to 10 −15 s −1 .

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