Points from Foregoing Letters

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    Abstract

    FROM a study of the correlation between indexes of solar activity and the critical frequences of the F% region of the ionosphere, W. M. Goodall concludes that a monthly average character figure based on radio observations gives a reasonably good measure of solar activity.

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    Points from Foregoing Letters. Nature 143, 985 (1939) doi:10.1038/143985a0

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