Letter | Published:

A New Spectral Characteristic in Solar Radio Emission


THE intense radio emissions from active areas on the Sun have been studied since 1942 on ‘single’ fixed frequencies; but the first ‘spectral’ or sweep frequency observations were not initiated until 1949, when Wild and McCready1 at Sydney commenced observations with equipment sweeping the band 70–130 Mc./s. These observations, which were later2 extended to 40–240 Mc./s., marked a notable advance in solar radio techniques, and greatly simplified the classification of solar radio phenomena.

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  1. 1

    Wild, J. P., and McCready, L. L., Aust. J. Sci. Res., A, 3, 387 (1950).

  2. 2

    Wild, J. P., Murray, J. D., and Rowe, W. C., Aust. J. Phys., 7, 439 (1954).

  3. 3

    Maxwell, A., Swarup, G., and Thompson, A. R., Proc. Inst. Rad. Eng. (in the press).

  4. 4

    Maxwell, A., Swarup, G., and Stone, P. H. (in preparation).

  5. 5

    Wild, J. P., Roberts, J. A., and Murray, J. D., Nature, 173, 532 (1954).

  6. 6

    Richardson, R. S., Astrophys. J., 114, 356 (1951).

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