Abstract
DURING the period March 1–April 6, 1960, the satellite Sputnik 3 passed over Britain at heights below 300 km., and on some sixty occasions the 20 Mc./s. signals were received at the Radio Research Station, Slough, when the satellite was close to or beyond the horizon, propagation being by ½-hop and 3/2-hop modes as has been reported for earlier satellites1. In the ½-hop mode the signal is reflected directly from the ionosphere to the receiving point, and, for the 3/2-hop mode, one ground reflexion precedes the ionospheric reflexion. Under these conditions, evidence has been obtained of strong focusing by the ionosphere of waves travelling along paths close to the skip-distance path.
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References
Bain, W. C., and Golton, E., Proc. First Int. Space Science Symp., Nice (1960).
Appleton, E. V., and Beynon, W. J. G., Proc. Phys. Soc., 59, 69 (1947).
Bremmer, H., “Terrestrial Radio Waves”, Chapter 8; also P.239 (Elsevier Pub. Co., Inc., 1949).
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GOLTON, E. Skip-Distance Ray-focusing in the Ionosphere. Nature 189, 48–49 (1961). https://doi.org/10.1038/189048a0
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DOI: https://doi.org/10.1038/189048a0
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