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- W2111472178 abstract "Interference effects appear on vertical-incidence ionograms from Ellsworth Station, which is located on the Filchner ice shelf in Antarctica. These effects are caused by energy which travels through the ice and is reflected upwards at the bottom of the ice shelf. Because the frequencies at which the minima of the interference pattern occur change in a systematic way for off-vertical reflections, it has been possible to calibrate the ionosonde system so that the angle-of-elevation of off-vertical traces can be calculated. This calibration has allowed a calculation of the ice thickness and the dielectric constant of the ice. It also gives information on the behaviour of the ionosphere when off-vertical reflections are present. In particular, it has allowed the detection of large-scale ionospheric disturbances which are observed at Ellsworth in the early evening hours. Ionosondes coupled to antenna systems, which would make them swept-frequency interferometers, have been suggested. These systems would produce interference patterns similar to those produced by the Flichner ice shelf." @default.
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- W2111472178 date "1968-01-01" @default.
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- W2111472178 title "Directional characteristics of ionosonde interference patterns from the Filchner ice shelf" @default.
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- W2111472178 doi "https://doi.org/10.1016/s0021-9169(68)80002-9" @default.
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