Abstract
RECENTLY there has been much interest in those catastrophic ionospheric disturbances which are supposed to produce ‘radio fade-outs’ on highfrequency radio waves and short-lived disturbances in the terrestrial magnetic records. In a recent report, Dellinger1 has given an account of the results of these disturbances, based on more than a year's observations by workers in different parts of the world, and he states that “ordinarily the intensities of the waves received from radio stations on frequencies below about 1,500 kc./s. are not perceptibly affected during a fade-out". He mentions, however, that Bureau2 has found an increase in the number of atmospherics on frequencies between 27 and 40 kc./s. during many of the disturbances ; this is the only evidence so far published that the propagation of low-frequency waves is affected at these times.
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References
Dellinger, Bur. Stand. J. Research, 19, 111 (1937).
Bureau, Comptes rendus, 203, 1257 (1936).
Best, Ratcliffe and Wilkes, Proc. Roy. Soc., A, 156, 614 (1937).
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BUDDEN, K., RATCLIFFE, J. An Effect of Catastrophic Ionospheric Disturbances on Low-Frequency Radio Waves. Nature 140, 1060–1061 (1937). https://doi.org/10.1038/1401060a0
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DOI: https://doi.org/10.1038/1401060a0
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