Abstract
IN an undisturbed and extended ionosphere, the maximum value of the frequency of radio waves which can be reflected by regular refraction processes is determined by the maximum electron density of the layer. The maximum value of the critical frequency at vertical incidence seldom exceeds 15 Mc./s.
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References
Harang, L., and Stoffregen, W., Z. Hochfrequenztech., 55, 105 (1940), On 41 Mc./s. Lovell, A. C. B., Clegg, J. A., and Ellyett, C. D., Nature, 160, 372 (1947), On 46 and 72 Mc./s. Forsyth, P. A., Petrie, W., Vawter, F., and Currie, B. W., Nature, 165, 561 (1950), On 32.7 Mc./s. Aspinall, A., and Hawkins, G. S., J. Brit. Astro. Assoc., 60 (1950), On 72 Mc./s. Hellgren, G., and Meos, J., Tellus, 4, 249 (1952), on 30.3 Mc./s.
Chapman, S., J. Atmo. Terr. Phys., 3, 1 (1953).
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HARANG, L., LANDMARK, B. Radio Echoes observed during Auroræ and Terrestrial Magnetic Storms using 35 and 74 Mc./s. Waves Simultaneously. Nature 171, 1017–1018 (1953). https://doi.org/10.1038/1711017a0
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DOI: https://doi.org/10.1038/1711017a0
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