Abstract
Denisse and Kundu1 have directed attention to the close relation between the variations of two indices of the solar cycle which represent the flux of two different types of solar radiation. The first index (Ch E = f 4 sec χ is based on the monthly mean critical frequency (f) of the E-layer at noon at Freiburg (Germany); it is assumed to be proportional to the flux of the ultra-violet and X-radiation of solar origin which is responsible for the atmospheric ionization at heights near 120 km. The second index is the monthly mean value (Φ) of the solar radio-noise flux at λ 10.7 cm., measured at Ottawa, which is available from February 1947 onwards. Denisse and Kundu conclude that the two types of radiation are produced, if not by the same mechanism, at least under closely correlated conditions.
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References
Denisse, J. F., and Kundu, M. R., C.R. Acad. Sci., Paris, 244, 45 (1957).
Minnis, C. M., J. Atmos. Terr. Phys., 9, 201 (1956).
Landmark, B., et al., Geofys. Pub., 19, 1 (1956).
Covington, A. E., et al., J. Roy. Astro. Soc. Canada, 59, 235 (1955).
Minnis, C. M., J. Atmos. Terr. Phys. (in the press).
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MINNIS, C., BAZZARD, G. Similarities in the Characteristics of Solar Radiation at γ 10.7 cm. and in the Far Ultra-violet. Nature 181, 1796 (1958). https://doi.org/10.1038/1811796a0
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DOI: https://doi.org/10.1038/1811796a0
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