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- W1971792004 abstract "From six months' observations of the signals of WWV Washington at Tatsfield, the median MUF for the Washington-Tatsfield circuit, for both the normal and disturbed propagation periods of each month, has been deduced, by a method based on the fact that the median MUF is the frequency below which signals are propagated for 50 per cent of the time in a given period. Graphs are given which show, for each hour of day, the percentage reduction in the median MUF caused by ionospheric disturbances during the summer, equinox, and winter, this quantity representing the severity of the disruptive effects upon communications. These effects are shown to be far more severe during the period from about 0700 to 1100 LT than at other times of day. This result, obtained from data on the reception of obliquely incident waves, is in good correspondence with the findings of Appieton and Piggott, obtained from vertical incidence data, from which it appears to be due to a tendency for the disturbances to be most intense at these times. At other times of day the severity of the disruptive effects is conditioned, not only by the intensity of the disturbances, but also by the value of the normal MUF at the time. Thus the effects are more severe during night than during day at all seasons, but more particularly during the winter night, when the normal MUF is particularly low." @default.
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- W1971792004 date "1955-07-01" @default.
- W1971792004 modified "2023-09-23" @default.
- W1971792004 title "Observations of the effects of ionospheric storms over a North Atlantic Circuit" @default.
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- W1971792004 doi "https://doi.org/10.1016/0021-9169(55)90127-6" @default.
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