Points from Foregoing Letters

    Abstract

    IRREGULAR. echoes of radio waves reflected from heights between 100 km. and 300 km. indicate, according to T. L. Eckersley, the presence of ionic clouds or irregularities in the ionosphere. Since the effect is noticeable both day and night, the sun cannot be responsible for this ionization, and it is suggested that the responsible agents might be small meteorites or high-speed particles from the stars.

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    Points from Foregoing Letters. Nature 140, 853 (1937). https://doi.org/10.1038/140853b0

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