Letter | Published:

Interpretation of Cosmic Noise Measurements at 3.8 Mc./s. from Satellite 1960 ηI

Naturevolume 191page480 (1961) | Download Citation



THE results of measurements of cosmic noise at 3.8 Mc./s. from the satellite 1960 η1 have been reported by Molozzi, Franklin and Tyas1. A puzzling feature was the variation in field-strength at different locations. These results have now been analysed, on the assumptions that variations in signal strength are due to three causes: (a) the variation of radiation resistance of the antenna due to the ionosphere surrounding of the satellite; (b) the restriction in angular aperture of the satellite antennæ due to the ionosphere; and (c) the variation of cosmic noise power over the sky. The results indicate that these are the most important factors affecting the cosmic radio signals.

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  1. 1

    Molozzi, A. R., Franklin, C. A., and Tyas, J. P. I., Nature, 190, 616 (1961).

  2. 2

    Steiger, W. R., and Warwick, J. W., J. Geophys. Res., 66, 57 (1961).

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  1. Defence Research Telecommunications Establishment, Ottawa

    • J. H. CHAPMAN
    •  & A. R. MOLOZZI


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