The number per unit area of radar echoes from isolated showers, as a function of echo radius r, is found by analysis of data from several localities to he proportional to exp (−βr), where β varies with time and place inversely as the intensity of convective activity. Calculated values of β range from 0.8 (n mi)−1 for intense convection to 1.7 (n mi)−1 for light shower activity occurring in trade-wind cumuli.
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Dennis et al. (1963) studied this question.
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