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The technique for studying the characteristics of the ionosphere by means of incoherent scattering of radio waves by free electrons was first postulated by Gordon [1958]. Experimental verification of this phenomenon has been demonstrated by Bowles [1958, 1961] of the National Bureau of Standards and by Pineo, Kraft, and Briscoe [1960a, b] of the Lincoln Laboratory. In this note, preliminary observations of incoherent scattering conducted at Trinidad, WIF (10.7°N, 61.6°W), with a high-powered pulsed radar operating at a frequency of approximately 400 Mc/s, are described.
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Millman et al. (1961) studied this question.
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