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). https://doi.org/10.1038/143985a0
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DOI: https://doi.org/10.1038/143985a0