Abstract
INCIDENTAL to radar studies of the aurora at Saskatoon, Canada (52.l°N., and 106.6° W.), with frequencies of 56 and 106.5 Mc./s., a persistent scatter echo is observed with the lower frequency. This echo arises apparently from the lower ionosphere. As viewed on a conventional range-amplitude display, the scattered signals appear extremely diffuse, but are quite evident on photographs of the display with exposures of a minute or more. A similar type of echo has never been detected at the higher frequency, although both radar units have about the same sensitivity and scan simultaneously the same parts of the sky.
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Bailey, D. K., Bateman, R., Berkner, L. V., Booker, H. G., Montgomery, G. F., Purcell, E. M., Salisbury, W. W., and Wiesner, J. B., Phys. Rev., 86, 141 (1952).
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FORSYTH, P., CURRIE, B. & VAWTER, F. Scattering of 56-Mc./s. Radio Waves from the Lower Ionosphere. Nature 171, 352–353 (1953). https://doi.org/10.1038/171352a0
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DOI: https://doi.org/10.1038/171352a0
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